Follow error was returned when submitting a build : BLD "DEMO:PAYROLL" /AREA="QA_AREA" / BUILD_OPTIONS =(DMREBUILDALL Error: Attempt to reactivate an active session.
This happens if the options tab in the build dialog is not clicked on to show the build options. If this dialog is not viewed then the command parameter / BUILD_OPTIONS =(DMXFERSOURCE=YES) is not included in the generated BLD command that Desktop Client submits.