User Exit for VA01 and VA02 transaction codes

Question

Hi,
I am writing a userexit for PO number checking for VA01 and VA02 transaction codes.The PO number should be unique in the table (vbkd-bstkd).Duplicate PO number entries can be checked with Sold-to Party.If anybody written something like this....please advice me...
Thanks in advance.
fractal

Answer 1

Hi Fractel,
Why are you looking for a user exit to do this duplicate PO check?
This can be achieved through configuration of your sales order document type and message control. Follow the path below for configuration of the document type.
Implementation Guide for R/3 Customizing (IMG)
-->Sales and Distribution
   -->Sales
      -->Sales Documents
         -->Sales Document Header
            -->Define Sales Document Types
Once you execute this node, you will see all the available document types. Select the one you are interested in and click the details icon. In the subsequent screen, under "General Control" section, there is a field "Check purch.order no". Pick the value 'A' from the drop-down list.
Once you do this, system will check for duplicate PO numbers whenever you are creating or changing the sales order with that document type. If duplicate, it issues a message.