We have a negative bill in the pay bills window that was created by JE in a previous year.  I have tried to create a bill to offset, but I cannot click on the negative balance to offset the invoice. -So that did not work. 

I tried a JE.  That did not work either. 

Rebuild did not work either. 

Please let me know if there is any other way to resolve this.  We are running Desktop Contractor 21.0.