SITUATION

• I have a Model called "Process"
• I have another Model called "Activity" and it has a many-to-one relationship with "Process"
• I have another Model called "Sequence" that also has a many-to-one relationship with Process.
• This same "Sequence" Model has a much to one relationship with "Activity"

PROBLEM

What should I do so that in the "Activity" relational field of the "Sequence" model, only the activities that are related to the same 'Process' that was already defined in the "Process" field of the "Sequence" model are displayed?