Gateway service WFSERVICE WorkflowTaskCollection Description returning null

Hi,

We are experiencing a problem on retrieving the Description of a WorkflowTask (with and without expand).

We use this URL:

/sap/opu/odata/IWWRK/WFSERVICE/WorkflowTaskCollection('<ID>')?$expand=Description

In JSON this returns:

"Description":null

In XML this returns:

<link href="WorkflowTaskCollection('<ID>')/Description" rel="http://schemas.microsoft.com/ado/2007/08/dataservices/related/Description" type="application/atom+xml;type=entry" title="Description">
<m:inline/>
</link>

I've been debugging the Gateway side (we are using the Gateway as HUB), and I can see the data of the description getting back to the gateway (method /IWFND/IF_MGW_CORE_RUNTIME~READ_ENTITY of class /IWFND/CL_MGW_RUNT_RCLNT_PRXY).

Somewhere in the final part of converting it seems to go wrong but I did not find it till now. Any ideas?