Q: enums with default being $required

[albertmink]

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          @wurzka can you double check here? 'rfcSettings' is of type enum with a default.

I assume that the object has the default rfcSettings and hence, the field shall be omitted during serialization.

Originally posted by @albertmink in https://github.com/SAP/abap-file-formats/pull/590#discussion_r1514468973