custom program call for external catalogue in SAP SRM

Hi Team,

     we had a recent system upgrade to 7.13 and since then our custom program to call external catalogue doesnt seem to be working from NWBC.

if i launch it from SAPGUI, it works seemlessly however it goes into an indefinite loop if i try it from the browser.

the only code which is different when the catalog is called from web browser is:

CALL FUNCTION 'BBP_WS_CALL'

         EXPORTING

           iv_webservice_id  = gv_service_id

         EXCEPTIONS

           ws_not_found      = 1

           wrong_customizing = 2

           OTHERS            = 3.

the same code works fine before upgrade, how its not working now.

Can anyone please share anything you have on this.

regards,

Tashi