Crystal Reports for Rational Application Developer Designer Guide
Working with custom functions
Crystal Reports
lets you create and modify custom functions, and use them in formulas.
Click the appropriate link to jump to that topic:
Creating custom functions
Viewing and modifying custom functions
Calling custom functions
Business Objects, an SAP company
http://www.businessobjects.com/
Support services
http://www.businessobjects.com/services/support/
Product Documentation on the Web
http://support.businessobjects.com/documentation/