How to correct wrong invoiced amount 1

[pro356]

Invoice is entered and mailed. Month later payment comes and realize I underbilled. Can I correct the original invoice? Do I create a new dummy invoice for the difference? Do I use some debit memo to adjust this?

 

[asshat]

A couple of ways to adjust:

In sales, issue invoice for difference
In receivables, issue debit memo or invoice for difference
In projects, do tm return and write up the rebill amt