diff --git a/server/AyaNova/biz/CustomerBiz.cs b/server/AyaNova/biz/CustomerBiz.cs
index dba9dc77..ec50571d 100644
--- a/server/AyaNova/biz/CustomerBiz.cs
+++ b/server/AyaNova/biz/CustomerBiz.cs
@@ -342,6 +342,8 @@ namespace AyaNova.Biz
                 AddError(ApiErrorCode.VALIDATION_REFERENTIAL_INTEGRITY, "generalerror", await Translate("Unit"));
             if (await ct.CustomerServiceRequest.AnyAsync(m => m.CustomerId == inObj.Id))
                 AddError(ApiErrorCode.VALIDATION_REFERENTIAL_INTEGRITY, "generalerror", await Translate("CustomerServiceRequest"));
+             if (await ct.PurchaseOrder.AnyAsync(m => m.DropShipToCustomerId == inObj.Id))
+                AddError(ApiErrorCode.VALIDATION_REFERENTIAL_INTEGRITY, "generalerror", await Translate("PurchaseOrder"));
 
             // await Task.CompletedTask;
         }
diff --git a/server/AyaNova/biz/PartBiz.cs b/server/AyaNova/biz/PartBiz.cs
index bb1ff032..db79907c 100644
--- a/server/AyaNova/biz/PartBiz.cs
+++ b/server/AyaNova/biz/PartBiz.cs
@@ -412,6 +412,8 @@ namespace AyaNova.Biz
                 AddError(ApiErrorCode.VALIDATION_REFERENTIAL_INTEGRITY, "generalerror", await Translate("PartInventoryList"));//translates to "Part inventory"
             if (await ct.PartStockLevel.AnyAsync(m => m.PartId == inObj.Id))
                 AddError(ApiErrorCode.VALIDATION_REFERENTIAL_INTEGRITY, "generalerror", await Translate("PartStockingLevels"));
+             if (await ct.PurchaseOrderItem.AnyAsync(m => m.PartId == inObj.Id))
+                AddError(ApiErrorCode.VALIDATION_REFERENTIAL_INTEGRITY, "generalerror", await Translate("PurchaseOrder"));
 
         }
 
diff --git a/server/AyaNova/biz/PartWarehouseBiz.cs b/server/AyaNova/biz/PartWarehouseBiz.cs
index 9c348251..7358ba58 100644
--- a/server/AyaNova/biz/PartWarehouseBiz.cs
+++ b/server/AyaNova/biz/PartWarehouseBiz.cs
@@ -271,6 +271,8 @@ namespace AyaNova.Biz
                 AddError(ApiErrorCode.VALIDATION_REFERENTIAL_INTEGRITY, "generalerror", await Translate("PartInventoryTransaction"));
             if (await ct.PartStockLevel.AnyAsync(m => m.PartWarehouseId == inObj.Id))
                 AddError(ApiErrorCode.VALIDATION_REFERENTIAL_INTEGRITY, "generalerror", await Translate("PartStockingLevels"));
+            if (await ct.PurchaseOrderItem.AnyAsync(m => m.PartWarehouseId == inObj.Id))
+                AddError(ApiErrorCode.VALIDATION_REFERENTIAL_INTEGRITY, "generalerror", await Translate("PurchaseOrder"));
 
         }
 
diff --git a/server/AyaNova/biz/ProjectBiz.cs b/server/AyaNova/biz/ProjectBiz.cs
index 596ca142..ac3b3deb 100644
--- a/server/AyaNova/biz/ProjectBiz.cs
+++ b/server/AyaNova/biz/ProjectBiz.cs
@@ -160,7 +160,7 @@ namespace AyaNova.Biz
                         AddError(ApiErrorCode.NOT_FOUND);
                         return false;
                     }
-                    ValidateCanDelete(dbObject);                    
+                    await ValidateCanDeleteAsync(dbObject);
                     if (HasErrors)
                         return false;
                     ct.Project.Remove(dbObject);
@@ -244,13 +244,9 @@ namespace AyaNova.Biz
                 }
             }
 
-
-            //Any form customizations to validate?
             var FormCustomization = await ct.FormCustom.AsNoTracking().SingleOrDefaultAsync(x => x.FormKey == AyaType.Project.ToString());
             if (FormCustomization != null)
             {
-                //Yeppers, do the validation, there are two, the custom fields and the regular fields that might be set to required
-
                 //validate users choices for required non custom fields
                 RequiredFieldsValidator.Validate(this, FormCustomization, proposedObj);
 
@@ -260,9 +256,12 @@ namespace AyaNova.Biz
 
         }
 
-        private void ValidateCanDelete(Project inObj)
+        private async Task ValidateCanDeleteAsync(Project inObj)
         {
-            //whatever needs to be check to delete this object
+            //Referential integrity 
+            //FOREIGN KEY CHECKS          
+            if (await ct.PurchaseOrder.AnyAsync(m => m.ProjectId == inObj.Id))
+                AddError(ApiErrorCode.VALIDATION_REFERENTIAL_INTEGRITY, "generalerror", await Translate("PurchaseOrder"));
         }
 
 
diff --git a/server/AyaNova/biz/VendorBiz.cs b/server/AyaNova/biz/VendorBiz.cs
index 1ab0d885..cdd328c9 100644
--- a/server/AyaNova/biz/VendorBiz.cs
+++ b/server/AyaNova/biz/VendorBiz.cs
@@ -293,6 +293,8 @@ namespace AyaNova.Biz
                 AddError(ApiErrorCode.VALIDATION_REFERENTIAL_INTEGRITY, "generalerror", await Translate("UnitModel"));
             if (await ct.Unit.AnyAsync(m => m.PurchasedFromVendorId == inObj.Id))
                 AddError(ApiErrorCode.VALIDATION_REFERENTIAL_INTEGRITY, "generalerror", await Translate("Unit"));
+
+
             //part has three potential references, if any match that's good enough since it's the same message
             if (await ct.Part.AnyAsync(z => z.ManufacturerId == inObj.Id) == true)
                 AddError(ApiErrorCode.VALIDATION_REFERENTIAL_INTEGRITY, "generalerror", await Translate("Part"));
@@ -300,6 +302,9 @@ namespace AyaNova.Biz
                 AddError(ApiErrorCode.VALIDATION_REFERENTIAL_INTEGRITY, "generalerror", await Translate("Part"));
             else if (await ct.Part.AnyAsync(z => z.AlternativeWholeSalerId == inObj.Id) == true)
                 AddError(ApiErrorCode.VALIDATION_REFERENTIAL_INTEGRITY, "generalerror", await Translate("Part"));
+
+            if (await ct.PurchaseOrder.AnyAsync(m => m.VendorId == inObj.Id))
+                AddError(ApiErrorCode.VALIDATION_REFERENTIAL_INTEGRITY, "generalerror", await Translate("PurchaseOrder"));
         }
 
 
diff --git a/server/AyaNova/models/AyContext.cs b/server/AyaNova/models/AyContext.cs
index 830ea67c..46c2c2b7 100644
--- a/server/AyaNova/models/AyContext.cs
+++ b/server/AyaNova/models/AyContext.cs
@@ -53,6 +53,7 @@ namespace AyaNova.Models
         public virtual DbSet<PMTemplateItem> PMTemplateItem { get; set; }
         public virtual DbSet<Project> Project { get; set; }
         public virtual DbSet<PurchaseOrder> PurchaseOrder { get; set; }
+        public virtual DbSet<PurchaseOrderItem> PurchaseOrderItem { get; set; }
         public virtual DbSet<Quote> Quote { get; set; }
         public virtual DbSet<QuoteItem> QuoteItem { get; set; }
         public virtual DbSet<QuoteTemplate> QuoteTemplate { get; set; }