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The customization for the DeltaQ component needs some parts of the SAP System to be modifiable.
These are the needed steps to do so:
In the Transaction SE03 you have to switch the Software Component with the technical name LOCAL to modifiable. In the lower part of the screen you will find the Name Range Customer Name Range. This has to be set to modifiable as well.
When you click Client Settings you get to the Client selection screen.
Click on the edit symbol then double click the client and you get to the settings screen.
In the section Cross-Client Object changes set the option to:
Changes to Repository and cross-client Customizing allowed
After successfully finished all steps of customization for DeltaQ you can change the settings to their default value.