Hi Community,
I have four DocuSign tabs mapped from Salesforce merge fields:
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Text Fields A, B, C
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Checkbox D
All fields are optional by default.
Validation Needed
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If the signer fills any one of Text Fields A/B/C → all three must be filled
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OR the signer can simply select Checkbox D
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Leaving all fields blank is allowed
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Partial entry in A/B/C is not allowed
Question
What is the best DocuSign way to enforce this signer-time validation?
Can this be achieved using Conditional Rules, or is another approach recommended?
(Screenshot attached for reference.)

Thanks!
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