Hello,
Create a step at the start of the workflow that calls TS01200205 (Generic Instantiate).
Pass it the key of KNA1 and 'KNA1'. Call the resulting object KNA1_TEST (create a workflow container element with this name).
After that step create a container operation step that copies KNA1_TEST.CUSTOMERGROUP to CUSTOMERGROUP_TEST (create a container element in the workflow for this too).
Run the workflow, see if CUSTOMERGROUP_TEST gets filled. If not, then add a Requested Start deadline of 1 minute to the step that calls TS01200205 and try it again.
regards
Rick Bakker