Yes, you must put a context on one of the two fields (in the view or in the field) and develop a name_get on thre res.partner object that returns different values according to the context.

OpenERP has already such an implementation for partners. This should work in your view, for v7:

<field name="contact_id"/>
<field name="contact_address_id" context="{'show_address': 1}" options='{"always_reload": True}'/>

Hi Fabien,

this helped me, thanks

this was he meant

def name_get(self,cr,uid,ids,context=None):
        if context is None:
            context ={}
        res=[]
        record_name=self.browse(cr,uid,ids,context)
        for object in record_name:

                if object.name
                   if context.get('show_address',False):
                          //name for contact_address_id field

                         res.append((object.id,object.name+object.address))
                  else:
                       //name for contact_id field                     

                      res.append((object.id,object.name))
        return res