I posted invoice 123 against PO due to some problem I tried to reverse the invoice 123 but system will not allow. I posted another invoice 678 with dif ref number for the same PO. Now I want to delete first invoice 123. so please help me how to do it. It should not be any problem with account posting etc. PO is created for text items no material (account assignment K ) so no GR. Please consider no excise duty posting nothing. My customer is not an Indian customer.