Extended rules can be stored in the function workordermanagement.setres_reservation().  
See Extended rules 
  
See Material booking > Automatic pre-assignment setting. 
  
PATH: Production > Work orders structure > right-click an entry > "Reservation". 
  
Window resevation_set_master.psr 
  
Boyum Style button design: 
  
  
These extended rules can be stored in the function "workordermanagement.src". (In project folder)  
Depending on the window a specific function is called, for example for reservations setres_reservation() 
  
See Pre-Assign buttons description 
For more information see 
UserEvents 
UserEvents for PreAssign 
  
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