Is it possible to add >0 validation to a field on unprocessed cost/misc costs?

Summary:

We want to enforce all misc costs/unprocessed costs must be '>0 due to system limitation. Is this possible via page composer? I didn't see an option to do so.

Content (required):

Need to add field validation to amount

Version (include the version you are using, if applicable):

23B

Code Snippet (add any code snippets that support your topic, if applicable):

NA