Help with Business Map - List Columns

[rslemer]

I created a new BM for list column

Module Service Contracts to Contacts

Defaul filters works fines

Custom Field - Works for search

But in pop up, system not show a value with any custom field

There any restriction for use a custom fields?

<map>
<originmodule>
<originname>Contacts</originname>
</originmodule>
<relatedlists>
<relatedlist>
<module>ServiceContracts</module>
<linkfield>lastname</linkfield>
<columns>

<field>
<label>CPF</label>
<name>CF_846</name>
</field>

<field>
<label>Sobrenome</label>
<name>lastname</name>
</field>

<field>
<label>Responsável</label>
<name>assigned_user_id</name>
</field>

</columns>
</relatedlist>
</relatedlists>
<popup>
<linkfield>lastname</linkfield>
<columns>
<field>
<label>CPF</label>
<name>cf_846</name>
</field>

<field>
<label>Nome</label>
<name>lastname</name>
</field>

<field>
<label>Celular</label>
<name>mobile</name>
</field>

<field>
<label>Responsável</label>
<name>assigned_user_id</name>
</field>

</columns>
</popup>
</map>

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and not clear for me how I use a <linkfield></linkfield>