Data Dictionary and Model Reference hierarchy

Hi,

I am currently working with data dictionaries but there is strange to me.

Is it mandatory that every parent model needs a reference in its data dictionary to each of its referenced models?

This would mean that in large hierarchical models I need to link the data dictionary to the corresponding model and I need to refernce this model in the parent models data dictionary. This makes the handling a little bit cumbersome.

Thanks for any help / suggestions.

Florian