Werk #11438: BI aggregations: REST API: only delete a rule if it is not referenced by aggregations/rules

Component	REST API
Title	BI aggregations: REST API: only delete a rule if it is not referenced by aggregations/rules
Date	Nov 3, 2020
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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