Problem with Popup window in BDC

Hi Gurus,

I have an SHDB record for transaction VA01 that is called by an ABAP code via "CALL TRANSACTION 'VA01' USING bdc_tab mode 'N' update 'S'".

It does work when I use the 'A' mode, but when I use 'N' mode it shows an error that can't find a window. But this window is a modal popup asking for copy the taxes for all entries in ITEM TAB.

We have many BDC here that works in 'N' mode, but none of them have modal popup windows.

I've already searched for this problem in SDN but I couldn't find any answer.

May anyone help me please?

Thanks very much.

Fabio Purcino