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How to create a custom validation for matrix table constant sum questions with many fields?

QualtricsUser
QualtricsUser Community Member, Qualtrics Brand Admin Qubie ✭
edited September 2020 in Custom Code

I have a Matrix Table constant sum question with 4 columns (over 50 fields in total).

How can I force that at least one field is filled - without setting up 50 individual custom validations?