We set up our clients with option to pay monthly invoices by themselves or thru provider/rep-payee so if at any time they switch who pays or pay more with the same payment towards a different invoice or client by using the option select other Client charges/invoices it can be recorded and applied. I understand there is work around but it takes time and effort and all of our clients are set up like that The workaround in NXT webview I could find is that each time that happens to go into client change the responsibility to the one that pays at the time so if the following month is not the same the invoice does not show up in available to apply invoices as there is no option select other clients invoices (it goes back to relationship option not being available when setting up new client)