Have a static field with a label containing "+" character

<formElement type="sb" ID="F1685" rank="4" required="0">
    <name>status</name>
    <label><![CDATA[Status]]></label>
    <bind type="static" is_rank_alpha="0">
        <items>
            <item ID="V2064" label="Code review" is_hidden="0"/>
            <item ID="V2065" label="Code review+" is_hidden="0"/>
        </items>
        <default_values>
            <value REF="V2064"/>
        </default_values>
    </bind>
</formElement>

Export tracker structure and then try to import it in an other projet, you shoul not have a validation error