Screen output without connection to user.

Hi ,

I'm a web dynpro novice.

I'm trying to do a "create new material web dyn pro programme" .

I try to use this bapi " BAPI_RETAILMATERIAL_CREATE " to do it.

I have this error " Screen output without connection to user " all time.

I guess, it's because i don't handle as it must be done the bapi output.

And if someone can advise me if i can pass over some bapi fields that i don't need for my screen.

Thanks in advance for your help.

Azmi