diff --git a/models/Category.php b/models/Category.php
index 252bdec..8c6c0b6 100755
--- a/models/Category.php
+++ b/models/Category.php
@@ -151,7 +151,7 @@
          */
         public function getProductUnit()
         {
-            return $this->hasOne(ProductUnit::className(), [ 'id' => 'product_unit_id' ]);
+            return $this->hasOne(ProductUnit::className(), [ 'id' => 'product_unit_id' ])->inverseOf('product');
         }
         
         /**
@@ -160,7 +160,7 @@
         public function getProducts()
         {
             return $this->hasMany(Product::className(), [ 'id' => 'product_id' ])
-                        ->viaTable('product_category', [ 'category_id' => 'id' ]);
+                        ->viaTable('product_category', [ 'category_id' => 'id' ])->inverseOf('categories');
         }
         
         /**
@@ -318,7 +318,7 @@
         public function getTaxGroups()
         {
             return $this->hasMany(TaxGroup::className(), [ 'id' => 'tax_group_id' ])
-                        ->viaTable('tax_group_to_category', [ 'category_id' => 'id' ]);
+                        ->viaTable('tax_group_to_category', [ 'category_id' => 'id' ])->inverseOf('categories');
         }
         
         /**
diff --git a/models/Product.php b/models/Product.php
index 3ce1249..67676b2 100755
--- a/models/Product.php
+++ b/models/Product.php
@@ -429,7 +429,7 @@
         public function getCategories()
         {
             return $this->hasMany(Category::className(), [ 'id' => 'category_id' ])
-                        ->viaTable('product_category', [ 'product_id' => 'id' ]);
+                        ->viaTable('product_category', [ 'product_id' => 'id' ])->inverseOf('products');
         }
         
         /**
diff --git a/models/TaxGroup.php b/models/TaxGroup.php
index b668032..841ce6e 100755
--- a/models/TaxGroup.php
+++ b/models/TaxGroup.php
@@ -138,7 +138,7 @@
         public function getCategories()
         {
             return $this->hasMany(Category::className(), [ 'id' => 'category_id' ])
-                        ->viaTable('tax_group_to_category', [ 'tax_group_id' => 'id' ]);
+                        ->viaTable('tax_group_to_category', [ 'tax_group_id' => 'id' ])->inverseOf('taxGroups');
         }
         
         /**
--
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