用<referenceinput>添加多个排序

Question

有人可以帮我吗：我如何使用多个字段对源进行排序？

<ReferenceInput label="Version" source="version" reference="versions" key="version" validate={[required()]} sort={{field: 'letter', order:'ASC'}}>
    <SelectInput optionText={version => `${version.major}.${version.minor}.${version.patch}.${version.letter}`} />                        
</ReferenceInput>