This Document Number has been used- Billing- MS Dynamics GP

First you have to delete the document number in RM00401 and run the following script:

Delete PA13100 where PADocnumber20 = 'XX'
Delete PA13200 where PADocnumber20 = 'XX'
Delete PA13202 where PADocnumber20 = 'XX'
Delete PA10802 where PADocnumber20 = 'XX'
Delete PA01901 where PADocnumber20 = 'XX'