so as it is already generate the IRN for tax invoice. Not able to cancel the invoice after 24hr of invoice posted. Invoice is having issue with customer master data field - AAGC wrong value, accounting doc is not getting posted. In order to refresh the account determination and post the billing to account we removed the base conditions and saved. So the invoice value become zero. Now when we try to assign the same condition back to billing. There is no option available to add condition in billing. What can be done in this case.