Move to HR to restrict second job offer,if we already have one employee on the same position

Summary:

We would like to see if we have an option to restirct, when we update the Overlap Allowed Flag to No on an existing position, which gives an error when we do Move to HR for a existing second job offer on the same postion. We know that it gives error if we create a second job offer but, we would like to see if it also restricts at the Move to HR.

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