In your table GV_Voucher, the column TransactionID has not been defined as a UNIQUE KEY

You will have to make TransactionID a UNIQUE KEY in GV_Voucher to create this FOREIGN KEY constraint

But, as I mentioned in your other thread, if the column TransactionID is indeed unique, then you need not add the column in your GV_ReceivedOffice table at all.

http://www.sqlservercentral.com/Forums/Topic1446803-391-1.aspx