Display error msg from BADI in WEBDYNPRO screen

Hi Experts,

I am using BAPI_PO_CREATE1 and BAPI_PO_CHANGE for PO creation and change in my WD component. And, already have few validation in BADI ME_PROCESS_PO_CUST for customary ME21n/ME22ns.

My requirement is to use the same validation that i have in 'CHECK' method of BADI in my WD component.

Since this BADI is getting called in both the BAPI FMs, how do i display the error msg from my CHECK method and display it in WD screen?

Which method or FM to use?

Currently using ' mmpur_message_forced' in CHECK badi, which eventhough getting triggered is not displaying any error message in WD screen.

Thanks.

Padma