After ILM partition switch not possible to drop previous partition

Document ID : KB000122789
Last Modified Date : 20/12/2018
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Issue:
User wants to drop a no longer active ILM partition and the following message pops up in AWI:

"U00005350 ILM: Partition name '000000001' for DROP is not valid." I attached share logs, screenshots and ILM related tables as needed. attached tables
Cause:
During the partition switch, some jobs were still running and they remained as active in the previous partition. As long as these Jobs are active the containing partition cannot be deactivated.
Resolution:
Wait for these Jobs to terminate or force their end by Cancelling them. Then the partition can be removable, and they can be dropped as desired.