If an activity definition is linked to the same service plan and asset as other activity definitions and it includes equivalent activities, but it is linked to a different schedule, it can be designated as overruling other activity definitions.

In Maintenance Planner, at Definitions & Schedules > Activity definitions, overruling activity definitions are selected in the Overruled by schedule from… field. The margins for overruling are specified in the Period of overruling schedule field.

Three activity definitions, A, B and C are linked to the same asset and service plan:

Activity definition B is overruled by Activity definition A, within a margin of plus or minus six days.

Activity definition C is overruled by Activity definition B, within a margin of plus or minus three days. If Activity definition B is deactivated, Activity definition A will overrule Activity definition C.