Unit price validation in Purchase Order, Goods Receipt PO and A/R Invoice

Question

Hello!
I want to have validation of the Unit Price field in Purchase Order, Goods Receipt PO and A/R Invoice documents.
This means that user has to get some kind of message if she/he do not enter the Unit price in above mentioned documents.
I can not use the price lists for this, to get the field populated automatically, because I do not have all the prices...
I am no longer newbie when it come to SAP, but this really puzzles me
Thanks,
Dejan

Answer 1

Hello guys,
I have tried to add this code to check if the field Unit Price was empty in the Purchase Order form (Object ID 22)
But it gives me an error message - Error converting data type varchar to numeric (CINF)
I am getting the same error message even if I have some value in the Unit Price field...
I am really confused - what is wrong with it???
Here is the code from the Transaction notification
IF (@object_type = N'22' AND @transaction_type in (N'A', N'U') )
     BEGIN
          IF EXISTS (SELECT T1.DocEntry FROM OPOR T0 inner join POR1 T1 on T0.DocEntry = T1.DocEntry
          WHERE (T1.PriceBefDi IS NULL OR T1.PriceBefDi = ' ') AND T0.DocEntry = @list_of_cols_val_tab_del)
               BEGIN
                    Set @error =1
                    set @error_message = 'Unit Price cannot be blank'
               END
     END
Thanks,
Dejan