To be able to change the flow of an invoice is restricted by the settings on the permission groups in PaletteArena.
The permission to change the flow of an invoice is set by the parameter Manage an invoice's flow in the My invoices-section under Administration > General information >Permission groups. 

 

There are three options of permission levels on the parameter:

0-Read
1-Add
2-Delete

This permission also effects the reports, which means that the role gets permission to make changes in the flow of an active invoice in all reports where you can drill down to the invoice detail view.

To add permission groups to a role, go to Administration > General information > Role. Find the role and check the box for the permission group in question. Click Save.