Field Selection in Work Centers 
In Customizing Work Centers under Define field selection, you can define the properties of selected data fields in work center screens .
A data field can be defined as:
an entry field
a required entry field
a hidden field
a highlighted field
The properties of the data fields in each screen group can be defined
in the Modified field view
in the Influencing view
Screen groups are for instance :
Basic Data
Default values
Scheduling
Capacity overview
The work center category for field selection is an influencing field in the work center in the standard system. This is the work center category that is used as a reference when you define field selection in Customizing.
Example
You want to specify in Customizing that only the standard value key SAP1 is used for work center category 0001:
Enter the standard value key SAP1 for work center category 0001 in the default work center .
Set the field Standard value key for work center category 0001 to display.