Posting Definition - Vendor Invoice Ax 2012

Hi,

I have enabled Using posting definition Under General ledger parameters.

I created Posting definition PO1 for module Purchasing and attached it in Transaction posting definitions.

When I posted Purchase order I was able to hit the accounts setup under Posting definition. But when I posted the invoice system is throwing an error Voucher do not balance.

Further, I went and created a posting definition PO2 for module Accounts payable. And attached this in Transaction posting definition for vendor invoice. But I am still getting the same error i.e. Voucher do not balance.

Please suggest. Or please let me know if I can refer any document for Posting definition related to vendor invoice.

Regards,

Rajat