In the Data Modeler you can change the directly assigned attributes.
You can only change the category (Cat) of attributes that were transferred from the Dictionary or inherited (indicated by an entry in the column Dic and/or Inh).
Choose Goto
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Attributes in the screen Change Entity Type: Definition. The Maintain Attributes screen appears.
Make your changes (see Entity type: Creating attributes).
Check the changed attributes before saving.
Click on Back to return to the entity type definition.