To Reverse an AIA Style Billing Application, follow the steps below. There is currently no “Reversal” button within the AIA Style Billing Module.
Work Order Tab
If an AIA Style Billing Application has not been generated, navigate to the Work Order tab within the job and select Sales Reversal. The reversal process is the same as it is for a standard job.

A new Tab will be added to the Job toolbar labeled CO then the Job Number followed by an R. Negative lines will be added to each positive item that was entered on the Job for Scheduled Values, Materials, and Commissions.
This job is now locked down, and no further data entry may be performed for the Job with the exception of returning parts to stock and crediting off any invoices previously created for the Job.
AIA Style Billing Tab
If an AIA Style Billing Application was generated and you want to issue a credit before completing the Reversal, first navigate to the AIA Style Billing tab.
From the AIA Style Billing Tab select New.

When the application opens, enter the previous application number and enter "R" in the field to the right of the Application No. field.

Select the Scheduled Values tab and enter a negative amount for the appropriate line item(s) that were previously billed.
Then:
Select Save if you need to review the application before completing the revision.
Select Finalize when you are ready to complete the revision.

Once Finalized, a Credit Invoice will be generated and shown on the AIA Billing Summary with an “R” under the Revision Column. The Credit will need to be manually applied to the Invoice.
After the Billing Application has been credited, navigate to the Work Order tab and follow the reversal process described above to complete the reversal.