SAP Note 27747 - Relationships and maint. packages exclude themselves

Symptom:

If you maintained a maintenance strategy including maintenance packages in the task list, you cannot create relationships or, the other way around, if you first maintained the relationships, you cannot allocate a maintenance strategy to the task list.

Cause and prerequisites

A parallel maintenance of maintenance packages and relationships for operations of the very same task list is no longer permitted.

Reason:
When you schedule a preventive maintenance plan, orders are generated automatically. The order operations are determined automatically because of the maintenance packages allocated to the operation in the task list.
If relationships were allowed between operations, the system would have to determine the relationships to be taken over into the order automatically based on the operations taken over. Unlike the material or PRT, however, the relationships are not directly allocated to the operation, but describe the dependency of two operations concerning procedure and time separately.
The only useful solution for such an automatic function would be not to take over the respective incoming and outgoing relationships for all operations that are not taken over.
However, an order with relationships which are determined that way leads to a result during scheduling which cannot be interpreted usefully.

Solution
1. The task list is created WITH relationships and WITHOUT maintenance strategy and maintenance packages.
2. The preventive maintenance plan is created without maintenance strategy (mixed task list).
3. The required cycles are determined (time-dependently or activity-dependently) in the preventive maintenance plan.
4. The previously created task list together with the relationship is allocated to the maintenance item in this preventive maintenance plan.
5. During the scheduling release, an order is created which contains all operations and relationships of the task list from the maintenance item.

This organizational solution contains the following restrictions:

1. The cycle refers to the entire task list and not to individual operations. As a result, different cycles for different operations of a task list are not permitted.
2. No shift factors are permitted.
3. No scheduling period is permitted.

Additional key words

IA01, IA02, IA05, IA06, IA11, IA12