Dynamics Portal: Entity reference in Entity Form

Pff, entity references can be difficult in the Dynamics portal...

I have a N:N reference between contact and account ("account is managed by contact").

When a portal user is adding a new account record in the portal, I would like to have the newly created account linked to the portal user (the account is managed by the portal user from now).

Somehow I fail... (The portal user has all the necessary create and "add to" privileges.)

What I tried:

• Set Entity Reference On Save = Yes
• Entity Logical Name = Contact
• Relationship Name = "Owner of"
• Target Lookup Attribute Logical Name = Empty
• Populate Lookup Field = No
• Reference Entity Source Type = Current portal user

And now I have to select the entity related to the current portal user... Instead I want to relate *with* the current user.

Is there an other way? Or is it best practice to build a workflow that connects the new account to the portal user?

Thanks!

Elowy