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You need to set 'Redo Fields' of the policy to severity slot. The policy will then get executed each time severity slot is changed. Please refer to Creating a new dynamic enrichment event management policy - Documentation for BMC TrueSight Infrastructure Management 11…
You can also set redo_fields with mposter command if you know the data_handle of the policy:
mposter -n <cell> -d -u <data_handle> -b "redo_fields=[severity]"