diff --git a/server/AyaNova/biz/TaxCodeBiz.cs b/server/AyaNova/biz/TaxCodeBiz.cs
index 25e66a96..e21a4901 100644
--- a/server/AyaNova/biz/TaxCodeBiz.cs
+++ b/server/AyaNova/biz/TaxCodeBiz.cs
@@ -160,7 +160,7 @@ namespace AyaNova.Biz
                         AddError(ApiErrorCode.NOT_FOUND);
                         return false;
                     }
-                    ValidateCanDelete(dbObject);
+                    await ValidateCanDeleteAsync(dbObject);
                     if (HasErrors)
                         return false;
                     if (HasErrors)
@@ -266,9 +266,12 @@ namespace AyaNova.Biz
 
         }
 
-        private void ValidateCanDelete(TaxCode inObj)
+        private async Task ValidateCanDeleteAsync(TaxCode inObj)
         {
-            //whatever needs to be check to delete this object
+            //Referential integrity 
+            //FOREIGN KEY CHECKS          
+            if (await ct.PurchaseOrderItem.AnyAsync(m => m.PurchaseTaxCodeId == inObj.Id))
+                AddError(ApiErrorCode.VALIDATION_REFERENTIAL_INTEGRITY, "generalerror", await Translate("PurchaseOrder"));
         }