diff --git a/src/test/kotlin/com/ecwid/apiclient/v3/entity/CartsTest.kt b/src/test/kotlin/com/ecwid/apiclient/v3/entity/CartsTest.kt
index cab47d6f..66148360 100644
--- a/src/test/kotlin/com/ecwid/apiclient/v3/entity/CartsTest.kt
+++ b/src/test/kotlin/com/ecwid/apiclient/v3/entity/CartsTest.kt
@@ -697,6 +697,6 @@ private fun UpdatedOrder.cleanupForComparison(order: UpdatedOrder): UpdatedOrder
 				}
 			)
 		},
-		customerFiscalCode = null,
+		customerFiscalCode = null, // ApiOrder has empty string instead of null
 	)
 }
diff --git a/src/test/kotlin/com/ecwid/apiclient/v3/entity/OrdersTest.kt b/src/test/kotlin/com/ecwid/apiclient/v3/entity/OrdersTest.kt
index e2e85d0a..2c7d7229 100644
--- a/src/test/kotlin/com/ecwid/apiclient/v3/entity/OrdersTest.kt
+++ b/src/test/kotlin/com/ecwid/apiclient/v3/entity/OrdersTest.kt
@@ -432,7 +432,7 @@ private fun UpdatedOrder.cleanupForComparison(order: UpdatedOrder): UpdatedOrder
 			val requestItem = order.items?.get(index)
 			item.cleanupForComparison(requestItem)
 		},
-		customerFiscalCode = null,
+		customerFiscalCode = null, // ApiOrder has empty string instead of null
 	)
 }