Hi Satish,
Two cents, do the screening of the BP using A1 and re-do the screening of the document using A2. If the system doesn't pick up the business partner with A1 screening, do the screening of the BP against the entire SPL using B1 and follow the document screening by B2. The version of 10.1 should allow you to release the document using A2 as suggested by Kul. Refer to KBA 1889911 which details about soft blocks.
Hope it helps!
-Shrini
