Hi Supriya,
As I don't have access to MRS components, cannot point to the correct place.
But If your attachments using GOS, these will be stored in table SRGBTBREL. Check out if your attachment goes into this table.
Otherwise, as suggested, set the SQL trace just before your do attachment function and after completion of it, find out the table used for attachments.
For setting sql trace in WDA:
Hope this helps you.
Regards,
Rama