You can set a reference indicator for each
default value in a work center and thus specify that the default value is referenced in the task list. This means that:If you remove the reference indicator in the work center, you can then change default values in the task list.

If you change data in the work center, only the data with a reference indicator is changed in the task list. The data in the operation is brought up-to-date the next time the task list is called up.

A reference indicator is set internally by the system for keys of performance efficiency rate.