diff --git a/src/generator/default/dbmodel.php b/src/generator/default/dbmodel.php
index 15c9f722..cd196bbd 100644
--- a/src/generator/default/dbmodel.php
+++ b/src/generator/default/dbmodel.php
@@ -146,14 +146,16 @@ public function get<?= $relation->getCamelName() ?>()
 <?php endif;?>
     }
 <?php endforeach; ?>
-<?php $i = 1; $usedRelationNames = [];
-foreach ($model->belongsToRelations as $relationName => $relation): ?><?php $number = in_array($relation->getCamelName(), $usedRelationNames) ? $i : '' ?>
+<?php $usedRelationNames = [];
+foreach ($model->belongsToRelations as $relationName => $relation): ?><?php
+
+    $i = in_array($relation->getCamelName(), $usedRelationNames) ? array_count_values($usedRelationNames)[$relation->getCamelName()]+1 : 1 ?>
 
     # belongs to relation
-    public function get<?= $relation->getCamelName() . ($number) ?>()
+    public function get<?= $relation->getCamelName() . ($i === 1 ? '' : $i) ?>()
     {
         return $this-><?= $relation->getMethod() ?>(\<?= trim($relationNamespace, '\\') ?>\<?= $relation->getClassName() ?>::class, <?php
     echo $relation->linkToString() ?>);
     }
-<?php $i++; $usedRelationNames[] = $relation->getCamelName(); endforeach; ?>
+<?php $usedRelationNames[] = $relation->getCamelName(); endforeach; ?>
 }
diff --git a/tests/specs/issue_fix/100_fix_numbering_issue_in_relation_names_in_case_of_more_than_one_similar_belongs_to_relation/index.php b/tests/specs/issue_fix/100_fix_numbering_issue_in_relation_names_in_case_of_more_than_one_similar_belongs_to_relation/index.php
new file mode 100644
index 00000000..b3b791d8
--- /dev/null
+++ b/tests/specs/issue_fix/100_fix_numbering_issue_in_relation_names_in_case_of_more_than_one_similar_belongs_to_relation/index.php
@@ -0,0 +1,13 @@
+<?php
+
+return [
+    'openApiPath' => '@specs/issue_fix/100_fix_numbering_issue_in_relation_names_in_case_of_more_than_one_similar_belongs_to_relation/index.yml',
+    'generateUrls' => false,
+    'generateModels' => true,
+    'excludeModels' => [
+        'Error',
+    ],
+    'generateControllers' => false,
+    'generateMigrations' => false,
+    'generateModelFaker' => false,
+];
diff --git a/tests/specs/issue_fix/100_fix_numbering_issue_in_relation_names_in_case_of_more_than_one_similar_belongs_to_relation/index.yml b/tests/specs/issue_fix/100_fix_numbering_issue_in_relation_names_in_case_of_more_than_one_similar_belongs_to_relation/index.yml
new file mode 100644
index 00000000..67312df9
--- /dev/null
+++ b/tests/specs/issue_fix/100_fix_numbering_issue_in_relation_names_in_case_of_more_than_one_similar_belongs_to_relation/index.yml
@@ -0,0 +1,42 @@
+openapi: "3.0.0"
+info:
+  version: 1.0.0
+  title: 100_fix_numbering_issue_in_relation_names_in_case_of_more_than_one_similar_belongs_to_relation
+paths:
+  /:
+    get:
+      summary: List
+      operationId: list
+      responses:
+        '200':
+          description: The information
+
+components:
+  schemas:
+    Address:
+      type: object
+      properties:
+        id:
+          type: integer
+        shortName:
+          type: string
+        postCode:
+          type: string
+          maxLength: 64
+    Foo:
+      type: object
+      properties:
+        id:
+          type: integer
+        address:
+          $ref: '#/components/schemas/Address'
+
+    Bar:
+      type: object
+      properties:
+        id:
+          type: integer
+        address:
+          $ref: '#/components/schemas/Address'
+        related_address:
+          $ref: '#/components/schemas/Address'
diff --git a/tests/specs/issue_fix/100_fix_numbering_issue_in_relation_names_in_case_of_more_than_one_similar_belongs_to_relation/mysql/models/Address.php b/tests/specs/issue_fix/100_fix_numbering_issue_in_relation_names_in_case_of_more_than_one_similar_belongs_to_relation/mysql/models/Address.php
new file mode 100644
index 00000000..abfd7d59
--- /dev/null
+++ b/tests/specs/issue_fix/100_fix_numbering_issue_in_relation_names_in_case_of_more_than_one_similar_belongs_to_relation/mysql/models/Address.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace app\models;
+
+class Address extends \app\models\base\Address
+{
+
+
+}
+
diff --git a/tests/specs/issue_fix/100_fix_numbering_issue_in_relation_names_in_case_of_more_than_one_similar_belongs_to_relation/mysql/models/Bar.php b/tests/specs/issue_fix/100_fix_numbering_issue_in_relation_names_in_case_of_more_than_one_similar_belongs_to_relation/mysql/models/Bar.php
new file mode 100644
index 00000000..77c185bc
--- /dev/null
+++ b/tests/specs/issue_fix/100_fix_numbering_issue_in_relation_names_in_case_of_more_than_one_similar_belongs_to_relation/mysql/models/Bar.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace app\models;
+
+class Bar extends \app\models\base\Bar
+{
+
+
+}
+
diff --git a/tests/specs/issue_fix/100_fix_numbering_issue_in_relation_names_in_case_of_more_than_one_similar_belongs_to_relation/mysql/models/Foo.php b/tests/specs/issue_fix/100_fix_numbering_issue_in_relation_names_in_case_of_more_than_one_similar_belongs_to_relation/mysql/models/Foo.php
new file mode 100644
index 00000000..bfbe456f
--- /dev/null
+++ b/tests/specs/issue_fix/100_fix_numbering_issue_in_relation_names_in_case_of_more_than_one_similar_belongs_to_relation/mysql/models/Foo.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace app\models;
+
+class Foo extends \app\models\base\Foo
+{
+
+
+}
+
diff --git a/tests/specs/issue_fix/100_fix_numbering_issue_in_relation_names_in_case_of_more_than_one_similar_belongs_to_relation/mysql/models/base/Address.php b/tests/specs/issue_fix/100_fix_numbering_issue_in_relation_names_in_case_of_more_than_one_similar_belongs_to_relation/mysql/models/base/Address.php
new file mode 100644
index 00000000..7dfca04b
--- /dev/null
+++ b/tests/specs/issue_fix/100_fix_numbering_issue_in_relation_names_in_case_of_more_than_one_similar_belongs_to_relation/mysql/models/base/Address.php
@@ -0,0 +1,50 @@
+<?php
+
+/**
+ * This file is generated by Gii, do not change manually!
+ */
+
+namespace app\models\base;
+
+/**
+ * This is the model class for table "addresses".
+ *
+ * @property int $id
+ * @property string $shortName
+ * @property string $postCode
+ *
+ */
+abstract class Address extends \yii\db\ActiveRecord
+{
+    public static function tableName()
+    {
+        return '{{%addresses}}';
+    }
+
+    public function rules()
+    {
+        return [
+            'trim' => [['shortName', 'postCode'], 'trim'],
+            'shortName_string' => [['shortName'], 'string'],
+            'postCode_string' => [['postCode'], 'string', 'max' => 64],
+        ];
+    }
+
+    # belongs to relation
+    public function getFoo()
+    {
+        return $this->hasOne(\app\models\Foo::class, ['address_id' => 'id']);
+    }
+
+    # belongs to relation
+    public function getBar()
+    {
+        return $this->hasOne(\app\models\Bar::class, ['address_id' => 'id']);
+    }
+
+    # belongs to relation
+    public function getBar2()
+    {
+        return $this->hasOne(\app\models\Bar::class, ['related_address_id' => 'id']);
+    }
+}
diff --git a/tests/specs/issue_fix/100_fix_numbering_issue_in_relation_names_in_case_of_more_than_one_similar_belongs_to_relation/mysql/models/base/Bar.php b/tests/specs/issue_fix/100_fix_numbering_issue_in_relation_names_in_case_of_more_than_one_similar_belongs_to_relation/mysql/models/base/Bar.php
new file mode 100644
index 00000000..74e15ac3
--- /dev/null
+++ b/tests/specs/issue_fix/100_fix_numbering_issue_in_relation_names_in_case_of_more_than_one_similar_belongs_to_relation/mysql/models/base/Bar.php
@@ -0,0 +1,45 @@
+<?php
+
+/**
+ * This file is generated by Gii, do not change manually!
+ */
+
+namespace app\models\base;
+
+/**
+ * This is the model class for table "bars".
+ *
+ * @property int $id
+ * @property int $address_id
+ * @property int $related_address_id
+ *
+ * @property \app\models\Address $address
+ * @property \app\models\Address $relatedAddress
+ */
+abstract class Bar extends \yii\db\ActiveRecord
+{
+    public static function tableName()
+    {
+        return '{{%bars}}';
+    }
+
+    public function rules()
+    {
+        return [
+            'address_id_integer' => [['address_id'], 'integer'],
+            'address_id_exist' => [['address_id'], 'exist', 'targetRelation' => 'address'],
+            'related_address_id_integer' => [['related_address_id'], 'integer'],
+            'related_address_id_exist' => [['related_address_id'], 'exist', 'targetRelation' => 'relatedAddress'],
+        ];
+    }
+
+    public function getAddress()
+    {
+        return $this->hasOne(\app\models\Address::class, ['id' => 'address_id']);
+    }
+
+    public function getRelatedAddress()
+    {
+        return $this->hasOne(\app\models\Address::class, ['id' => 'related_address_id']);
+    }
+}
diff --git a/tests/specs/issue_fix/100_fix_numbering_issue_in_relation_names_in_case_of_more_than_one_similar_belongs_to_relation/mysql/models/base/Foo.php b/tests/specs/issue_fix/100_fix_numbering_issue_in_relation_names_in_case_of_more_than_one_similar_belongs_to_relation/mysql/models/base/Foo.php
new file mode 100644
index 00000000..1ae50310
--- /dev/null
+++ b/tests/specs/issue_fix/100_fix_numbering_issue_in_relation_names_in_case_of_more_than_one_similar_belongs_to_relation/mysql/models/base/Foo.php
@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * This file is generated by Gii, do not change manually!
+ */
+
+namespace app\models\base;
+
+/**
+ * This is the model class for table "foos".
+ *
+ * @property int $id
+ * @property int $address_id
+ *
+ * @property \app\models\Address $address
+ */
+abstract class Foo extends \yii\db\ActiveRecord
+{
+    public static function tableName()
+    {
+        return '{{%foos}}';
+    }
+
+    public function rules()
+    {
+        return [
+            'address_id_integer' => [['address_id'], 'integer'],
+            'address_id_exist' => [['address_id'], 'exist', 'targetRelation' => 'address'],
+        ];
+    }
+
+    public function getAddress()
+    {
+        return $this->hasOne(\app\models\Address::class, ['id' => 'address_id']);
+    }
+}
diff --git a/tests/unit/issues/Issue100Test.php b/tests/unit/issues/Issue100Test.php
new file mode 100644
index 00000000..3f7abe73
--- /dev/null
+++ b/tests/unit/issues/Issue100Test.php
@@ -0,0 +1,24 @@
+<?php
+
+namespace tests\unit\issues;
+
+use tests\DbTestCase;
+use Yii;
+use yii\helpers\FileHelper;
+
+class Issue100Test extends DbTestCase
+{
+    // https://github.com/php-openapi/yii2-openapi/issues/100
+    public function testFixNumberingIssueInRelationNamesInCaseOfMoreThanOneSimilarBelongsToRelation()
+    {
+        $testFile = Yii::getAlias("@specs/issue_fix/100_fix_numbering_issue_in_relation_names_in_case_of_more_than_one_similar_belongs_to_relation/index.php");
+        $this->runGenerator($testFile);
+        $actualFiles = FileHelper::findFiles(Yii::getAlias('@app'), [
+            'recursive' => true,
+        ]);
+        $expectedFiles = FileHelper::findFiles(Yii::getAlias("@specs/issue_fix/100_fix_numbering_issue_in_relation_names_in_case_of_more_than_one_similar_belongs_to_relation/mysql"), [
+            'recursive' => true,
+        ]);
+        $this->checkFiles($actualFiles, $expectedFiles);
+    }
+}