Validation required so that invoice, billing and accounting is done on same

Validation required so that invoice, billing and accounting is done on same date as the PGI date. Very urgent please help.

Please look into the below scenario.

Excise invoice posting date u2013 07.10.2011

A/c doc posting date u2013 29.09.2011

Reflecting in dispatch report of 07.10.2011.

GL affecting in the month of Sep.

So it want that on PGI date, billing , invoice and accounting enteries are created