Hi, 

In IFS, you can set an invoice line to have an exception code. The exception codes can be used for disputed items.   

To do this - go into the Finance Folder, in the customer invoice analysis area, and det to the customer invoice detail screen.  This can be an option from the customer invoices analysis screen. Scroll on the lines and see the invoice exception code.   When a line has an exception code the invoice is then marked as having an exception code.   The status of the invoice does not change.   You can then include / exclude this with credit. 

Best regards, 

IFS Employee