Insert values to WFUSER entity using saveEntity from the SOA layer

Hi,

I am trying to mass update users using SOA layer, which I can do fine for default properties, and single extended properties, but I can't do it for one-to-multiple entities. I have a custom entity named PermisoImputacion which I can select one or many entries for an user.

So, basically I'm trying something like this:

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"; xmlns:tem="http://tempuri.org/">;

<soapenv:Header/>

<soapenv:Body>

<tem:saveEntity>

<!--Optional:-->

<tem:entityInfo>

<BizAgiWSParam><Entities>

<WFUSER key='72'>

<CentrodeCosto>2100-M4610</CentrodeCosto>

<PermisoImputacionRol>

<idp_PermisoImputacionRol key='2' />

</PermisoImputacionRol>

</WFUSER>

</Entities></BizAgiWSParam>

</tem:entityInfo>

</tem:saveEntity>

</soapenv:Body>

</soapenv:Envelope>

The CentrodeCosto entity as being a simple entity updates just fine, but I can't add entries to the PermisoImputacionRol entity.

Any help is greatly appreciated, thanks!