Is "Saved Input to" required to be filled for "Read only" fields

Hi, 

New to Appian..basic question

Learning the 'Exercise 9: Process Modeling 101, Part 2' (Page 4 and 5) for Certified Associate Developer Course. 

Relevant Text - annotated below.

I need to create a Maintenance Request Interface with few read only fields: Make, Model, etc. The instruction below says to fill the 'Save Input To'. Is it required if the fields are read only ? 

thanks in advance :-) 

jaideep

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