DB347012 after turning on DB security

Document ID : KB000099637
Last Modified Date : 01/06/2018
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Turned on DB security for one database (internal) and created a Resource Category containing the RUNUNIT resource and granted to relevant user so why do I still get DB347012 security violation?
A RESOURCE CATEGORY is a SYSTEM resource and must be defined in the SYSTEM dictionary/catalog.
The security system will only look in SYSTEM dictionary for CATEGORY definitions and privileges.
In this case it was defined in an application dictionary so was not found at runtime.