Demand.xml selectSingle configuration need to update in TYPO3 12

[kp-keval]

In TYPO3 12, when we use the renderType > selectSingle, then we need to provide the item's numIndex with the label and value instead of numIndex inside numIndex.

<config>
    <type>select</type>
    <renderType>selectSingle</renderType>
    <items type="array">
        <numIndex index="0">
            <label>Label A</label>
            <value>0</value>
        </numIndex>
        <numIndex index="1" type="array">
            <label>Label B</label>
            <value>1</value>
        </numIndex>
    </items>
    <size>1</size>
    <minitems>1</minitems>
    <maxitems>1</maxitems>
</config>

Please check at https://github.com/TYPO3GmbH/blog/blob/master/Configuration/FlexForms/Demand.xml

It is an improvement, So please check it and share your thoughts on the same.

Thank you!