Error: Component Usage MODEL Cannot Reference Component Usages

Question

Hi,
I have a scenario where my main component acts as a place holder for views from several view components, all of which implement a common component interface.
The data (contexts) for all of these views are obtained by context mapping from a common component (model component). Hence, I need to pass reference of model_comp to each of the view comp's through "enter_referencing_mode" done in a method called set_model( ) in each view comp's component controller.
I have taken care not to explicitly instantiate the model in any view comp., but instantiate the model only once in my main comp and pass its reference around.
However, I get a dump "Component Usage MODEL Cannot Reference Component Usages" . The CX_WDR_RT_EXCEPTION is raised in the method ENSURE_NO_REFERENCING_MODE of class CL_WDR_COMPONENT_USAGE.
(If I remove data-binding of any UI elements placed on the view components (i.e, model context values never used), it no longer dumps! But that's not possible.)
Please help!
Best regards,
Adithya

Answer 1

Hi Sascha/Regina,
Thanks for your replies. As far as re-modelling my application goes, we are too far ahead with this to re-think on the refactoring of model into assitance classes. I will take into account for all subsequent developments.
However, could you please provide me with some tips which could help solve my problem: Model component context is used first as the view is loaded as soon as I navigate to the next step in the Roadmap. I am not instantiating explicitly or having any reference to model component's cotnext in WDDOINIT of comp. controller of any view component.
The code for the set_model method (to pass the model comp's reference around) is as follows:
method SET_MODEL( )
  DATA: l_ref_model TYPE REF TO if_wd_component_usage.
  l_ref_model = wd_this->wd_cpuse_model( ).
  l_ref_model->enter_referencing_mode( model_usage ).
Also, suppose I have two component usages (one for the model comp, one for a custom-built value help comp) in each view, should both be instantiated in the main comp. first and the instances of both be passed around? If so, how do I do this, using the same method -(above)?
Many thanks,
Adithya