server/AyaNova/biz/PurchaseOrderBiz.cs

@@ -322,11 +322,12 @@ namespace AyaNova.Biz
             bool isNew = currentObj == null;
 
             //No poitem can receive negative amounts
-            foreach (var propPOItem in proposedObj.Items)
+            for (int i = 0; i < proposedObj.Items.Count; i++)
             {
+                var propPOItem = proposedObj.Items[i];
                 if (propPOItem.QuantityReceived < 0 || propPOItem.QuantityReceived > propPOItem.QuantityOrdered)
                 {
-                    AddError(ApiErrorCode.VALIDATION_INVALID_VALUE, "generalerror", "LT:PurchaseOrderReceiptItemQuantityReceivedErrorInvalid");
+                    AddError(ApiErrorCode.VALIDATION_INVALID_VALUE, $"Items[{i}].QuantityReceived", "LT:PurchaseOrderReceiptItemQuantityReceivedErrorInvalid");
                     return;
                 }
             }

server/AyaNova/biz/RequiredFieldsValidator.cs

@@ -40,11 +40,11 @@ namespace AyaNova.Biz
                         //TODO: CHILD COLLECTION MOD
                         /*
                         Update RequiredFieldsValidator to look for these period seperated items and navigate through teh collection by name / reflection to step through children and flag errors to include parent 
-			e.g in validation error field name could be "poitems.vendorpartnumber:3" to indicate poitems collection 4th row has error in vendorpartnumber
-			or perhaps it makes sense to add a seperate INDEX property to make client processing easier and not a colon:index scheme in the field name (that actually makes more sense)
+			e.g in validation error field name could be "poitems[3].vendorpartnumber" to indicate poitems collection 4th row has error in vendorpartnumber
                         */
                         //Now get the actual property name from the available fields using the lt key
                         string RequiredPropertyName = FF.FieldKey;
+                        
 
                         //use reflection to get the underlying value from the proposed object to be saved
                         object propertyValue = proposedObject.GetType().GetProperty(RequiredPropertyName).GetValue(proposedObject, null);

server/AyaNova/biz/ValidationError.cs

@@ -1,8 +1,15 @@
 namespace AyaNova.Biz
 {
-//TODO: CHILD COLLECTION MOD add "Index" property to indicate child collection index location of error
+
     public class ValidationError
     {
+        //TARGET is the Model name of the property which matches the client UI annotations for ref
+
+        //if the target error is a child item collection field the Target must be "items[2].field" 
+        //where "items" is the item collection model name and 2 is the index of the collection with the error and field is the ultimate field model name
+        //Case doesn't matter as the client will compare in lower case all items anyway
+
+        
         public ApiErrorCode Code { get; set; }
         public string Target { get; set; }
         public string Message { get; set; }