diff --git a/src/lib/AttributeResolver.php b/src/lib/AttributeResolver.php
index a43aa8ba..cc41a6fb 100644
--- a/src/lib/AttributeResolver.php
+++ b/src/lib/AttributeResolver.php
@@ -498,9 +498,13 @@ protected function resolvePropertyRef(PropertySchema $property, Attribute $attri
         $attribute->setPhpType($fkProperty->guessPhpType())
             ->setDbType($fkProperty->guessDbType(true))
             ->setSize($fkProperty->getMaxLength())
-            ->setDescription($fkProperty->getAttr('description'))
+            ->setDescription($fkProperty->getAttr('description', ''))
             ->setDefault($fkProperty->guessDefault())
             ->setLimits($min, $max, $fkProperty->getMinLength());
+
+        if ($fkProperty->hasEnum()) {
+            $attribute->setEnumValues($fkProperty->getAttr('enum'));
+        }
         $this->attributes[$property->getName()] =
             $attribute->setFakerStub($this->guessFakerStub($attribute, $fkProperty));
     }
diff --git a/src/lib/migrations/BaseMigrationBuilder.php b/src/lib/migrations/BaseMigrationBuilder.php
index 416311d9..ded9a7af 100644
--- a/src/lib/migrations/BaseMigrationBuilder.php
+++ b/src/lib/migrations/BaseMigrationBuilder.php
@@ -491,7 +491,7 @@ public function tmpSaveNewCol(string $tableAlias, \cebe\yii2openapi\db\ColumnSch
 
         Yii::$app->db->createCommand()->createTable($tmpTableName, $column)->execute();
         if (ApiGenerator::isPostgres() && $columnSchema->comment) {
-            Yii::$app->db->createCommand("COMMENT ON COLUMN $tmpTableName.$columnSchema->name IS {$this->db->quoteValue($columnSchema->comment)}")->execute();
+            Yii::$app->db->createCommand("COMMENT ON COLUMN $tmpTableName.\"$columnSchema->name\" IS {$this->db->quoteValue($columnSchema->comment)}")->execute();
         }
 
         $table = Yii::$app->db->getTableSchema($tmpTableName);
diff --git a/src/lib/openapi/PropertySchema.php b/src/lib/openapi/PropertySchema.php
index 9ff64094..eade252e 100644
--- a/src/lib/openapi/PropertySchema.php
+++ b/src/lib/openapi/PropertySchema.php
@@ -70,6 +70,7 @@ class PropertySchema
 
     /** @var string $refPointer */
     private $refPointer;
+    private $uri;
 
     /** @var \cebe\yii2openapi\lib\openapi\ComponentSchema $refSchema */
     private $refSchema;
@@ -170,6 +171,7 @@ private function initReference():void
     {
         $this->isReference = true;
         $this->refPointer = $this->property->getJsonReference()->getJsonPointer()->getPointer();
+        $this->uri = $this->property->getJsonReference()->getDocumentUri();
         $refSchemaName = $this->getRefSchemaName();
         if ($this->isRefPointerToSelf()) {
             $this->refSchema = $this->schema;
@@ -194,6 +196,7 @@ private function initItemsReference():void
             return;
         }
         $this->refPointer = $items->getJsonReference()->getJsonPointer()->getPointer();
+        $this->uri = $items->getJsonReference()->getDocumentUri();
         if ($this->isRefPointerToSelf()) {
             $this->refSchema = $this->schema;
         } elseif ($this->isRefPointerToSchema()) {
@@ -264,7 +267,9 @@ public function getSelfTargetProperty():?PropertySchema
 
     public function isRefPointerToSchema():bool
     {
-        return $this->refPointer && strpos($this->refPointer, self::REFERENCE_PATH) === 0;
+        return $this->refPointer &&
+            ((strpos($this->refPointer, self::REFERENCE_PATH) === 0) ||
+                (str_ends_with($this->uri, '.yml')) || (str_ends_with($this->uri, '.yaml')));
     }
 
     public function isRefPointerToSelf():bool
@@ -300,8 +305,13 @@ public function getRefSchemaName():string
         $pattern = strpos($this->refPointer, '/properties/') !== false ?
             '~^'.self::REFERENCE_PATH.'(?<schemaName>.+)/properties/(?<propName>.+)$~'
             : '~^'.self::REFERENCE_PATH.'(?<schemaName>.+)$~';
+        $separateFilePattern = '/((\.\/)*)(?<schemaName>.+)(\.)(yml|yaml)(.*)/'; # https://github.com/php-openapi/yii2-openapi/issues/74
         if (!\preg_match($pattern, $this->refPointer, $matches)) {
-            throw new InvalidDefinitionException('Invalid schema reference');
+            if (!\preg_match($separateFilePattern, $this->uri, $separateFilePatternMatches)) {
+                throw new InvalidDefinitionException('Invalid schema reference');
+            } else {
+                return $separateFilePatternMatches['schemaName'];
+            }
         }
         return $matches['schemaName'];
     }
diff --git a/tests/specs/issue_fix/74_invalid_schema_reference_error/Product.yaml b/tests/specs/issue_fix/74_invalid_schema_reference_error/Product.yaml
new file mode 100644
index 00000000..ca81d464
--- /dev/null
+++ b/tests/specs/issue_fix/74_invalid_schema_reference_error/Product.yaml
@@ -0,0 +1,18 @@
+# Product:
+title: Product
+x-table: products
+type: object
+
+required:
+  - id
+  - vat_rate
+
+properties:
+  id:
+    type: integer
+  vat_rate:
+    type: string
+    enum:
+      - standard
+      - none
+    default: standard
diff --git a/tests/specs/issue_fix/74_invalid_schema_reference_error/index.php b/tests/specs/issue_fix/74_invalid_schema_reference_error/index.php
new file mode 100644
index 00000000..cbe2f6dc
--- /dev/null
+++ b/tests/specs/issue_fix/74_invalid_schema_reference_error/index.php
@@ -0,0 +1,13 @@
+<?php
+
+return [
+    'openApiPath' => '@specs/issue_fix/74_invalid_schema_reference_error/index.yaml',
+    'generateUrls' => false,
+    'generateModels' => true,
+    'excludeModels' => [
+        'Error',
+    ],
+    'generateControllers' => false,
+    'generateMigrations' => true,
+    'generateModelFaker' => true, // `generateModels` must be `true` in order to use `generateModelFaker` as `true`
+];
diff --git a/tests/specs/issue_fix/74_invalid_schema_reference_error/index.yaml b/tests/specs/issue_fix/74_invalid_schema_reference_error/index.yaml
new file mode 100644
index 00000000..271c63d1
--- /dev/null
+++ b/tests/specs/issue_fix/74_invalid_schema_reference_error/index.yaml
@@ -0,0 +1,25 @@
+openapi: "3.0.0"
+info:
+  version: 1.0.0
+  title: Invalid schema reference error \#74
+paths:
+  /:
+    get:
+      responses:
+        '200':
+          description: The information
+
+components:
+  schemas:
+    Invoice:
+      type: object
+      required:
+        - vat_rate
+      properties:
+        id:
+          type: integer
+        vat_rate:
+          #           $ref: '#/components/schemas/Product/properties/vat_rate' # issue is not observed
+          $ref: './Product.yaml#/properties/vat_rate'  # issue is observed
+    Product:
+      $ref: ./Product.yaml
diff --git a/tests/specs/issue_fix/74_invalid_schema_reference_error/mysql/migrations_mysql_db/m200000_000000_create_table_invoices.php b/tests/specs/issue_fix/74_invalid_schema_reference_error/mysql/migrations_mysql_db/m200000_000000_create_table_invoices.php
new file mode 100644
index 00000000..1e21544d
--- /dev/null
+++ b/tests/specs/issue_fix/74_invalid_schema_reference_error/mysql/migrations_mysql_db/m200000_000000_create_table_invoices.php
@@ -0,0 +1,20 @@
+<?php
+
+/**
+ * Table for Invoice
+ */
+class m200000_000000_create_table_invoices extends \yii\db\Migration
+{
+    public function up()
+    {
+        $this->createTable('{{%invoices}}', [
+            'id' => $this->primaryKey(),
+            'vat_rate' => 'enum("standard", "none") NOT NULL DEFAULT \'standard\'',
+        ]);
+    }
+
+    public function down()
+    {
+        $this->dropTable('{{%invoices}}');
+    }
+}
diff --git a/tests/specs/issue_fix/74_invalid_schema_reference_error/mysql/migrations_mysql_db/m200000_000001_create_table_products.php b/tests/specs/issue_fix/74_invalid_schema_reference_error/mysql/migrations_mysql_db/m200000_000001_create_table_products.php
new file mode 100644
index 00000000..fcde7ba8
--- /dev/null
+++ b/tests/specs/issue_fix/74_invalid_schema_reference_error/mysql/migrations_mysql_db/m200000_000001_create_table_products.php
@@ -0,0 +1,20 @@
+<?php
+
+/**
+ * Table for Product
+ */
+class m200000_000001_create_table_products extends \yii\db\Migration
+{
+    public function up()
+    {
+        $this->createTable('{{%products}}', [
+            'id' => $this->primaryKey(),
+            'vat_rate' => 'enum("standard", "none") NOT NULL DEFAULT \'standard\'',
+        ]);
+    }
+
+    public function down()
+    {
+        $this->dropTable('{{%products}}');
+    }
+}
diff --git a/tests/specs/issue_fix/74_invalid_schema_reference_error/mysql/models/BaseModelFaker.php b/tests/specs/issue_fix/74_invalid_schema_reference_error/mysql/models/BaseModelFaker.php
new file mode 100644
index 00000000..c367fbb4
--- /dev/null
+++ b/tests/specs/issue_fix/74_invalid_schema_reference_error/mysql/models/BaseModelFaker.php
@@ -0,0 +1,144 @@
+<?php
+
+namespace app\models;
+
+use Faker\Factory as FakerFactory;
+use Faker\Generator;
+use Faker\UniqueGenerator;
+
+/**
+ * Base fake data generator
+ */
+abstract class BaseModelFaker
+{
+    /**
+     * @var Generator
+    */
+    protected $faker;
+    /**
+     * @var UniqueGenerator
+    */
+    protected $uniqueFaker;
+
+    public function __construct()
+    {
+        $this->faker = FakerFactory::create(str_replace('-', '_', \Yii::$app->language));
+        $this->uniqueFaker = new UniqueGenerator($this->faker);
+    }
+
+    abstract public function generateModel($attributes = []);
+
+    public function getFaker():Generator
+    {
+        return $this->faker;
+    }
+
+    public function getUniqueFaker():UniqueGenerator
+    {
+        return $this->uniqueFaker;
+    }
+
+    public function setFaker(Generator $faker):void
+    {
+        $this->faker = $faker;
+    }
+
+    public function setUniqueFaker(UniqueGenerator $faker):void
+    {
+        $this->uniqueFaker = $faker;
+    }
+
+    /**
+     * Generate and return model
+     * @param array|callable $attributes
+     * @param UniqueGenerator|null $uniqueFaker
+     * @return \yii\db\ActiveRecord
+     * @example MyFaker::makeOne(['user_id' => 1, 'title' => 'foo']);
+     * @example MyFaker::makeOne( function($model, $faker) {
+     *        $model->scenario = 'create';
+     *        $model->setAttributes(['user_id' => 1, 'title' => $faker->sentence]);
+     *        return $model;
+     *  });
+     */
+    public static function makeOne($attributes = [], ?UniqueGenerator $uniqueFaker = null)
+    {
+        $fakeBuilder = new static();
+        if ($uniqueFaker !== null) {
+            $fakeBuilder->setUniqueFaker($uniqueFaker);
+        }
+        $model = $fakeBuilder->generateModel($attributes);
+        return $model;
+    }
+
+    /**
+     * Generate, save and return model
+     * @param array|callable $attributes
+     * @param UniqueGenerator|null $uniqueFaker
+     * @return \yii\db\ActiveRecord
+     * @example MyFaker::saveOne(['user_id' => 1, 'title' => 'foo']);
+     * @example MyFaker::saveOne( function($model, $faker) {
+     *        $model->scenario = 'create';
+     *        $model->setAttributes(['user_id' => 1, 'title' => $faker->sentence]);
+     *        return $model;
+     *  });
+     */
+    public static function saveOne($attributes = [], ?UniqueGenerator $uniqueFaker = null)
+    {
+        $model = static::makeOne($attributes, $uniqueFaker);
+        $model->save();
+        return $model;
+    }
+
+    /**
+     * Generate and return multiple models
+     * @param int $number
+     * @param array|callable $commonAttributes
+     * @return \yii\db\ActiveRecord[]|array
+     * @example TaskFaker::make(5, ['project_id'=>1, 'user_id' => 2]);
+     * @example TaskFaker::make(5, function($model, $faker, $uniqueFaker) {
+     *       $model->setAttributes(['name' => $uniqueFaker->username, 'state'=>$faker->boolean(20)]);
+     *       return $model;
+     * });
+     */
+    public static function make(int $number, $commonAttributes = [], ?UniqueGenerator $uniqueFaker = null):array
+    {
+        if ($number < 1) {
+            return [];
+        }
+        $fakeBuilder = new static();
+        if ($uniqueFaker !== null) {
+            $fakeBuilder->setUniqueFaker($uniqueFaker);
+        }
+        return array_map(function () use ($commonAttributes, $fakeBuilder) {
+            $model = $fakeBuilder->generateModel($commonAttributes);
+            return $model;
+        }, range(0, $number -1));
+    }
+
+    /**
+     * Generate, save and return multiple models
+     * @param int $number
+     * @param array|callable $commonAttributes
+     * @return \yii\db\ActiveRecord[]|array
+     * @example TaskFaker::save(5, ['project_id'=>1, 'user_id' => 2]);
+     * @example TaskFaker::save(5, function($model, $faker, $uniqueFaker) {
+     *       $model->setAttributes(['name' => $uniqueFaker->username, 'state'=>$faker->boolean(20)]);
+     *       return $model;
+     * });
+     */
+    public static function save(int $number, $commonAttributes = [], ?UniqueGenerator $uniqueFaker = null):array
+    {
+        if ($number < 1) {
+            return [];
+        }
+        $fakeBuilder = new static();
+        if ($uniqueFaker !== null) {
+            $fakeBuilder->setUniqueFaker($uniqueFaker);
+        }
+        return array_map(function () use ($commonAttributes, $fakeBuilder) {
+            $model = $fakeBuilder->generateModel($commonAttributes);
+            $model->save();
+            return $model;
+        }, range(0, $number -1));
+    }
+}
diff --git a/tests/specs/issue_fix/74_invalid_schema_reference_error/mysql/models/Invoice.php b/tests/specs/issue_fix/74_invalid_schema_reference_error/mysql/models/Invoice.php
new file mode 100644
index 00000000..43e37fd3
--- /dev/null
+++ b/tests/specs/issue_fix/74_invalid_schema_reference_error/mysql/models/Invoice.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace app\models;
+
+class Invoice extends \app\models\base\Invoice
+{
+
+
+}
+
diff --git a/tests/specs/issue_fix/74_invalid_schema_reference_error/mysql/models/InvoiceFaker.php b/tests/specs/issue_fix/74_invalid_schema_reference_error/mysql/models/InvoiceFaker.php
new file mode 100644
index 00000000..a8fe4f81
--- /dev/null
+++ b/tests/specs/issue_fix/74_invalid_schema_reference_error/mysql/models/InvoiceFaker.php
@@ -0,0 +1,41 @@
+<?php
+namespace app\models;
+
+use Faker\UniqueGenerator;
+
+/**
+ * Fake data generator for Invoice
+ * @method static Invoice makeOne($attributes = [], ?UniqueGenerator $uniqueFaker = null);
+ * @method static Invoice saveOne($attributes = [], ?UniqueGenerator $uniqueFaker = null);
+ * @method static Invoice[] make(int $number, $commonAttributes = [], ?UniqueGenerator $uniqueFaker = null)
+ * @method static Invoice[] save(int $number, $commonAttributes = [], ?UniqueGenerator $uniqueFaker = null)
+ */
+class InvoiceFaker extends BaseModelFaker
+{
+
+    /**
+     * @param array|callable $attributes
+     * @return Invoice|\yii\db\ActiveRecord
+     * @example
+     *  $model = (new PostFaker())->generateModels(['author_id' => 1]);
+     *  $model = (new PostFaker())->generateModels(function($model, $faker, $uniqueFaker) {
+     *            $model->scenario = 'create';
+     *            $model->author_id = 1;
+     *            return $model;
+     *  });
+    **/
+    public function generateModel($attributes = [])
+    {
+        $faker = $this->faker;
+        $uniqueFaker = $this->uniqueFaker;
+        $model = new Invoice();
+        //$model->id = $uniqueFaker->numberBetween(0, 1000000);
+        $model->vat_rate = $faker->randomElement(['standard','none']);
+        if (!is_callable($attributes)) {
+            $model->setAttributes($attributes, false);
+        } else {
+            $model = $attributes($model, $faker, $uniqueFaker);
+        }
+        return $model;
+    }
+}
diff --git a/tests/specs/issue_fix/74_invalid_schema_reference_error/mysql/models/Product.php b/tests/specs/issue_fix/74_invalid_schema_reference_error/mysql/models/Product.php
new file mode 100644
index 00000000..a8411efa
--- /dev/null
+++ b/tests/specs/issue_fix/74_invalid_schema_reference_error/mysql/models/Product.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace app\models;
+
+class Product extends \app\models\base\Product
+{
+
+
+}
+
diff --git a/tests/specs/issue_fix/74_invalid_schema_reference_error/mysql/models/ProductFaker.php b/tests/specs/issue_fix/74_invalid_schema_reference_error/mysql/models/ProductFaker.php
new file mode 100644
index 00000000..e05a7636
--- /dev/null
+++ b/tests/specs/issue_fix/74_invalid_schema_reference_error/mysql/models/ProductFaker.php
@@ -0,0 +1,41 @@
+<?php
+namespace app\models;
+
+use Faker\UniqueGenerator;
+
+/**
+ * Fake data generator for Product
+ * @method static Product makeOne($attributes = [], ?UniqueGenerator $uniqueFaker = null);
+ * @method static Product saveOne($attributes = [], ?UniqueGenerator $uniqueFaker = null);
+ * @method static Product[] make(int $number, $commonAttributes = [], ?UniqueGenerator $uniqueFaker = null)
+ * @method static Product[] save(int $number, $commonAttributes = [], ?UniqueGenerator $uniqueFaker = null)
+ */
+class ProductFaker extends BaseModelFaker
+{
+
+    /**
+     * @param array|callable $attributes
+     * @return Product|\yii\db\ActiveRecord
+     * @example
+     *  $model = (new PostFaker())->generateModels(['author_id' => 1]);
+     *  $model = (new PostFaker())->generateModels(function($model, $faker, $uniqueFaker) {
+     *            $model->scenario = 'create';
+     *            $model->author_id = 1;
+     *            return $model;
+     *  });
+    **/
+    public function generateModel($attributes = [])
+    {
+        $faker = $this->faker;
+        $uniqueFaker = $this->uniqueFaker;
+        $model = new Product();
+        //$model->id = $uniqueFaker->numberBetween(0, 1000000);
+        $model->vat_rate = $faker->randomElement(['standard','none']);
+        if (!is_callable($attributes)) {
+            $model->setAttributes($attributes, false);
+        } else {
+            $model = $attributes($model, $faker, $uniqueFaker);
+        }
+        return $model;
+    }
+}
diff --git a/tests/specs/issue_fix/74_invalid_schema_reference_error/mysql/models/base/Invoice.php b/tests/specs/issue_fix/74_invalid_schema_reference_error/mysql/models/base/Invoice.php
new file mode 100644
index 00000000..d81c8ce3
--- /dev/null
+++ b/tests/specs/issue_fix/74_invalid_schema_reference_error/mysql/models/base/Invoice.php
@@ -0,0 +1,35 @@
+<?php
+
+/**
+ * This file is generated by Gii, do not change manually!
+ */
+
+namespace app\models\base;
+
+/**
+ * This is the model class for table "invoices".
+ *
+ * @property int $id
+ * @property string $vat_rate
+ *
+ */
+abstract class Invoice extends \yii\db\ActiveRecord
+{
+    public static function tableName()
+    {
+        return '{{%invoices}}';
+    }
+
+    public function rules()
+    {
+        return [
+            'required' => [['vat_rate'], 'required'],
+            'vat_rate_string' => [['vat_rate'], 'string'],
+            'vat_rate_in' => [['vat_rate'], 'in', 'range' => [
+                'standard',
+                'none',
+            ]],
+            'vat_rate_default' => [['vat_rate'], 'default', 'value' => 'standard'],
+        ];
+    }
+}
diff --git a/tests/specs/issue_fix/74_invalid_schema_reference_error/mysql/models/base/Product.php b/tests/specs/issue_fix/74_invalid_schema_reference_error/mysql/models/base/Product.php
new file mode 100644
index 00000000..184a6395
--- /dev/null
+++ b/tests/specs/issue_fix/74_invalid_schema_reference_error/mysql/models/base/Product.php
@@ -0,0 +1,35 @@
+<?php
+
+/**
+ * This file is generated by Gii, do not change manually!
+ */
+
+namespace app\models\base;
+
+/**
+ * This is the model class for table "products".
+ *
+ * @property int $id
+ * @property string $vat_rate
+ *
+ */
+abstract class Product extends \yii\db\ActiveRecord
+{
+    public static function tableName()
+    {
+        return '{{%products}}';
+    }
+
+    public function rules()
+    {
+        return [
+            'required' => [['vat_rate'], 'required'],
+            'vat_rate_string' => [['vat_rate'], 'string'],
+            'vat_rate_in' => [['vat_rate'], 'in', 'range' => [
+                'standard',
+                'none',
+            ]],
+            'vat_rate_default' => [['vat_rate'], 'default', 'value' => 'standard'],
+        ];
+    }
+}
diff --git a/tests/unit/IssueFixTest.php b/tests/unit/IssueFixTest.php
index f1b2bfe8..11134111 100644
--- a/tests/unit/IssueFixTest.php
+++ b/tests/unit/IssueFixTest.php
@@ -962,4 +962,19 @@ public function test63JustColumnNameRename()
         $this->checkFiles($actualFiles, $expectedFiles);
         Yii::$app->db->createCommand('DROP TABLE IF EXISTS {{%fruits}}')->execute();
     }
+
+    // https://github.com/php-openapi/yii2-openapi/issues/63
+    public function test74InvalidSchemaReferenceError()
+    {
+        $testFile = Yii::getAlias("@specs/issue_fix/74_invalid_schema_reference_error/index.php");
+        $this->runGenerator($testFile);
+        $actualFiles = FileHelper::findFiles(Yii::getAlias('@app'), [
+            'recursive' => true,
+        ]);
+        $expectedFiles = FileHelper::findFiles(Yii::getAlias("@specs/issue_fix/74_invalid_schema_reference_error/mysql"), [
+            'recursive' => true,
+        ]);
+        $this->checkFiles($actualFiles, $expectedFiles);
+        $this->runActualMigrations();
+    }
 }