You can use the Filter Source Rows option to filter and manually map source rows to the target business entities or relationships. For example, the source file contains a CreditCard source row and you need to map this row to the correct target business entity. Drag and drop the CreditCard source row to the Filter Source Rows panel. A list of target business entities display with Credit Card as one of the options. You can map the CreditCard source row to the Credit Card target business entity.