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Use
In the standard system, CATS notebook replaces the picklists in the offline database table completely with the picklists it receives from SAP R/3 during synchronization. You can use the ISynchronizationInboundHandler to control the operation if, for example, you want to carry out a delta synchronization.

You can also use the MYCATS01 SAP enhancement to influence the picklists in CATS notebook. For more information, see
Integration
Use the following elements to implement the IsynchronizationInboundHandler interface: