I get 'infopath cannot submit the form because it contains errors' when trying to create new item in External List. The External Content Type this list is built on has a reference to another External Content Type.
The external types are Phase and Project. Phase referencing a Project using ProjectID field. On the InfoPath form generated for 'New Item' action for Phases list there is a External Item Picker. If I replace this control with a simple text box for the ProjectID - problem disappear. But I need to use 'External Item Picker'.
Any ideas?