Validate Salary Amount field with a DFF Assignment field?

Summary:

Hi experts,

we are currently working on an autocomplete rule that validates the Salary amount inserted in the Salary section by showing an error message whenever it is not equals to the amount inserted in a DFF field "Expected amount" created in Assignment section.

Here is the logic rule implemented

Is this feasible?

I continue receiving the following error:

Customer Name: Istituto Centrale Banche Popolari Italiane s.p.a (ICBPI)

Usecase # 3

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