Mandatory selection for 'selectone.ftl' field in a Form

[d_franz]

I have generated a Forms for sepecific data types of my new data model. I am using some selectOne fields to fill up the metadata.

How can I make a selection of the select one mandatory? In the moment even when I set the field to mandatory (in content model definition) I can save without a selection.

In the moment I defined the selectone in"share-config-custome.xml" as follows:

<field id="nci:sensor_recordMode" set="SensorInfoGlobal">
   <control template="/org/alfresco/components/form/controls/selectone.ftl">
   <control-param name="options">scann,starr</control-param>                   
   <control-param name="forceEditable">true</control-param>
   </control>
</field>
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I defined the field in the content model as follows:

     <property name="nci:sensor_recordMode">
        <title>Aufnahmeverfahren</title>
        <type>d:text</type>
        <mandatory>true</mandatory>
        <multiple>false</multiple>
        <index enabled="true">
            <atomic>true</atomic>
            <stored>true</stored>
            <tokenised>both</tokenised>
        </index>
    </property>
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[mitpatoliya]

well you can have LIST constrain on that property where only those values are permitted so if none of them are selected you will get error.