Custom prefix and package are required for each data model. These are necessary to be able to create dynamic and parallel workflows, multi-value business rules, and field properties.
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1. To add prefix/package, use Tcode MDGIMG. Expand Data Modeling and choose Edit Data Model.
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2. Choose the data model and select Prefix and Packages for Model Enhancements.
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3. Change the prefix to a custom prefix. Also enter a custom package if a standard package is assigned. Save the entries.
If there is already a custom package assigned, it is advisable to choose the same package for the objects/rules that you want to create in RDG and the same transport request used to save these changes.