Prefix Numbers after upgrade to 6.20

["Schröder, Ute Marion"]

Hi workflowers,
 
I=B4ve a problem concearning Prefix Numbers.
We've upgraded from 4.6B to 6.20 and now I'm trying to implement a new=20
task in my workflow.
Being not successful is caused by non-existing Prefic Number for 620.
We've had the Prefix number 900 in 4.6B.
Is it possible to use this one in 6.20 too, or do I have to use a =
different
one?
 
Any help welcome.
 
Thanx
 
 
Ute