Syntax formula for Not blank/empty

Hi All

I am hoping this is a simple one to solve

We have a number of requirements to display/require fields if another field is not empty

Syntax below gets accepted but is never true

What is the correct reference to use?

I have tried

not(equal($pr_date_proofs_rejected, " "))

not(equal($pr_date_proofs_rejected, "blank"))

not(equal($pr_date_proofs_rejected, "null"))

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