Call a Webdynpro fom BBP_DOC_CHECK_BADI in bid comparison

Hello Specialists,

I need to call a Z webdynpro from badi BBP_DOC_CHECK_BADI in bid comparison screen.

The proccess is the next:

When the analyst accept any bid( in bid comparison screen BUSBUS2202)i need that add "free text" to justify your choise.

Is it posible to do?

Thanks!

Ale