To check which payment voucher used to knock off based on the known invoice number. let say user want to check this Purchase Invoice (PI1110/101) has been knock off to what Payment voucher.
Go to Supplier > Master Reports > Bill Listing.
Empty the date from and to.
Then in Bill no. from enter from PI1110/101 to PI1110/101. Preview.
Click on the Document No. and the payment voucher no will appear (Applicable if the payment is make)