ENHO field `customzing` does not follow the rules for default values. Refer to https://github.com/SAP/abap-file-formats/blob/4df86464e64f3e7e3fe14ee23c23075d8abf4366/file-formats/enho/type/zif_aff_enho_v1.intf.abap#L258 Documentation see https://github.com/SAP/abap-file-formats/blob/main/docs/json.md#default-values.