Determination of Validity 

Use

Each element in a maintenance task list (for example, operation, sub-operation, material component) is valid for a certain period of time. You can specify validity by entering the key date when creating or changing a task list.

Features

If you change a task list or an object within a task list using a change number, the system overwrites the key date with the "Valid from" date specified for the change number.

The validity of an object depends on

The following table clearly explains the dependencies:

Processing type

Change number

Validity

Create

Yes

Unlimited from the change number date

Create

Yes

Unlimited from the change number date

Change

No

From the last valid date
Example:
From the date the task list was created or from the change number date if the task list was previously changed using a change number

Change

Yes

From the change number date