Please find the following steps to add an NSF fee to an invoice

1.  Void the payment i. expand the invoice transaction ii. void the payment

2. Void the invoice to the left of the invoice i. select the void ii. enter reason

3. add the NSF Fee to the policy endorsement > policy > endorsement/fees/taxes > add item > fee/tax > add NSF fee > to the right of the fee select actions > reciveable > update bottom left, and, lastly

4. go to documents > invoices > add new and proceed as normal and this will pull in the NSF fee.

I hope this helps!  Please don't hesitate to contact us with any questions.  Thank you!