You can enhance business process master data with your own additional fields. To do this, you can use the following SAP enhancement:
COOMBP01 Business process: user-defined additional fields in the master record
This enhancement contains the following enhancement components:
Enhancements, in contrast to modifications, are basically release- insensitive, as they are executed in a name space reserved for the customer, and not in the standard R/3 System.
For more information on how to use enhancements, see the documentation for enhancement transaction CMOD by choosing "Utilities -> Online Handbook" in the section "Function Exits".
For more general information, see the documentation for enhancement transaction CMOD by choosing "Display SAP Docu".