MIDAS Documentation v4.21
Updating Invoice Status
Once an invoice has been printed or emailed, it can no longer be modified (as after printing or emailing, MIDAS assumes that the invoice has been "finalized"). Once an invoice has been "finalized", you can however still update its status as payments are received.
To update the status of an invoice:
If you enter an amount in the PAID field that's less than the amount outstanding on the invoice, MIDAS will offer a "Mark outstanding amount as credit?" option. If selected, when updating the invoice's status any outstanding amount will be shown as a credit on the invoice, reducing the outstanding balance to zero.
For example, if an invoice total is $200, you enter $180 in the PAID field and select the "Mark outstanding amount as credit?" option, then the invoice will be updated to show that $180 has been paid against the invoice, and the remaining balance ($20) has been added as a credit.
This feature effectively allows you to mark invoices as "complete" even if the client has underpaid.
If you instead enter an amount in the PAID field that's more than the amount outstanding on the invoice, MIDAS will mark the difference as a credit on the invoice, and will add that difference as a credit on the client's record in the database (any credit associated with a client record in MIDAS is automatically deducted from their next invoice).