BTE events - FI userexit functions

Transaction codes for BTE are:

FIBF Maintenance BTE
BERE Business Event Repository
BERP Business Processes
BF31 Application modules per Event
BF32 Partner Modules per Event
BF34 Customer Modules per Event
BF41 Application Modules per Process
BF42 Partner Modules per Process
BF44 Customer Modules per Process