If you create a maintenance task list for a piece of equipment, or a functional location with a bill of material (BOM), you can use an existing maintenance task list for a piece of equipment or functional location with an identical structure, but its own BOM number, as a reference. The system will only copy certain objects from the reference.

The following example clearly explains how the system copies data:

Equipment 1 has the following structure:

Equipment 2 is bought at a later date. Its structure is identical to that of Equipment 1 and you therefore copy the bill of material from Equipment 1. This means that the bill of material for Equipment 2 has a different number from that of Equipment 1.

The maintenance task list 1 already exists in the Plant Maintenance application component for Equipment 1. Materials 1 through 4 from the equipment BOM are assigned to this task list.

For Equipment 2, you can create the maintenance task list task list 2 using the maintenance task list task list 1 as a reference.

Maintenance task list task list 2 contains only materials 3 and 4.

When you create a maintenance task list using a reference, the system only copies parts with an identical bill of material reference. Only materials 3 and 4 have the same reference in both equipment task lists, that is, Assembly 1. In contrast, materials 1 and 2 refer to Equipment 1 and Equipment 2 respectively.

To ensure that the system copies all the materials assigned to the reference, when you create a maintenance task list using a reference, you must create one bill of material that is valid for all the identically structured pieces of equipment. To do this you must specify a construction type for each piece of equipment and create a bill of material for this construction type. This bill of material is identical to the bill of material for Equipment 1 from the example. However, as it has an individual number and as this number is included in the master record for each identical bill of material, the identical bill of material reference is produced. When you create a maintenance task list using a reference, the system can therefore copy all the materials assigned in the reference.