When trying to drop an ILM partition from AWI the following error is displayed:
ILM: Partition name '%s' for DROP is invalid.
In the WP log the following error appears:
U00005350 ILM: Partition name '%s' for DROP is not valid
Check the parameter UC_ILM_SETTINS > ONLINE_PARTITIONS
If the value is equal or greater than the number of partition on disk, you are not allowed to drop the partition.
Reduce ONLINE_PARTITIONS if a drop is needed. No restart is necessary.