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Comparing ABAP Code 
Routines in Transfer and Update Rules
The Business Information Warehouse does not allow code to be compared in routines.
In cases where you need to manage extensive ABAP code, we advise you to outsource this code to a function module. Code in function modules can be compared using the AAK. If you are interested in owning this product, speak to your SAP representative.
See also:
Start Routine in
Transfer Rules
Update Routines
and Start Routines
Creating Update
Routines