Try creating a UNIQUE KEY constraint with both the columns on GV_Voucher table.

Your FOREIGN KEY constraint in GV_ReceivedOffice table should again be based on these 2 columns.

ALTER TABLE GV_ReceivedOffice ADD CONSTRAINT FK_ReceivedOffice_Voucher_VoucherNo_TransactionID

FOREIGN KEY (VoucherNo,TransactionID) REFERENCES GV_Voucher (VoucherNo,TransactionID)