Problem: Invoice global code got changed from 319 to 001. But we want our invoice to be continued from 320.

The most likely reason for this is that the ‘Enable annual numbering resets’ checkbox is enabled in your Projetex. To make sure, go to "Administrator > Codes" in the Workstation (only for Sytem Administrator accounts). We would like to notice that if ‘Enable annual numbering resets’ has been selected, these resets cannot be rolled back. In that case, to change your current invoice numbering from 001 to 320, you will need to go to Administrator > Codes, click Next Codes and change the Next Global Invoice Code to 320.