I want to insert a test in a qweb report for sales orders which displays a certain text when the responsible for the associated project contains a certain name.

So far I have used this without any luck:

<t t-if="'John Doe' in [o.ks_generated_project_id.user_id]">

    <span>

    Text to show

    </span>

</t>

The same test does work when I use a field from the sales order itself (e.g. [o.name]) instead of the linked project.

How can I achieve my test to a linked object? 

Remark: in our installation we have added a flow to link sales orders with projects - possibly this is the root cause?