Hello Biswanath,
Have you changed the table structure of A805,meaning have you added or deleted any fields
from this table?
From your earlier reply, looks like there exists unprocessed BDoc because of which generation
cannot be performed.
So it expects you to process/delete those BDocs first, so that generation can happen
successfully and no inconsistency would be caused.
Unprocessed Bdocs in a system can be easily found with
trx. SMW03 (they could be in any client). Please refer to
SAP note no. 423096 and enter the Bdoc types there specified in SMW03.
To reprocess the Bdocs or delete them please use trx. SMW01 or SMW02.
Once this is done, you can try to activate the table.
Hope this helps!
Best Regards,
Shanthala.