The form routines must be defined in a user module pool (type ‘M’) or subroutine pool (type ‘S’).

The Include LSVCMCOD in the function group SVCM, which realizes the view cluster maintenance, must be in the module pool or the subroutine pool, as it is needed for using global data.

At runtime the user routines are called dynamically from the central part of the view cluster maintenance. As the call is outside the generated subdialogs, when messages are sent in the routine: W and E messages are processed by the screen processor on the view cluster maintenance initial screen, i.e. they immediately cancel the complete maintenance dialog. As this is usually not desired, an S or I message must be sent by the user routine, even for errors.