You can post a negative progress bill journal to report any negative progress on an activity or a complete project after the invoice is posted.
You can use this to report the correct progress when you have posted a higher progress than the percentage of completion times the contract value.
Steps
Go to Project management and accounting > Journals > Progress bill > Project.
Click New.
In the Progress bill journal name field, enter or select a value.
In the Project ID field, enter or select a value.
In the Invoice date field, enter a date.
Click OK.
In the From date field, enter a date.
In the To date field, enter a date.
In the list, find and select the desired record.
In the Current progress quantity field, enter a number.
You can enter a negative progress quantity, progress amount, or progress percentage. In these steps, you enter a negative progress percentage.
In the Progress % field, enter a number.
Close the page.
Click Post.
Click OK.
Close the page.
Go to Default dashboard.