For operation S10 of the reference operation set you entered a time of 10 minutes for the Processing time standard value parameter. For operation S20 you entered a time of 5 minutes for the Setup time standard value parameter and a time of 20 minutes for the Processing time standard value parameter (see graphic, top box).

In routing A you make a cross-reference to reference operation set S as standard task S. You assign a work center, that has the standard value parameters Setup time and Processing time, to standard task S. The following applies:

Setup time S = setup time S20 = 5 minutes, also processing time S = processing time S10 + processing time S20 = 30 minutes (see graphic, bottom box).

If the work center for operation S20 also had the standard value parameter Teardown time, this would produce an error, since the work center for work center operation set S does not have this standard value parameter.