[FIX]The DELETE statement conflicted with the REFERENCE constraint FK_subplan_job_id. The conflict occurred in database msdb, table dbo.sysmaintplan_subplans, column job_id. The statement has been terminated

delete from msdb..sysmaintplan_log
where plan_id not in (
select plan_id from msdb..sysmaintplan_plans
)

delete from msdb..sysmaintplan_subplans
where plan_id not in (
select plan_id from msdb..sysmaintplan_plans

Sqljunkieshare