Eligibility criterion for a performance document based on Fast Formula

Summary:

Eligibility criterion for a performance document based on Fast Formula

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Hi,

we would like to create an eligibilty profile for a performance document which is based on two assignment flexfields (flexfield code: PER_ASG_DF). Our goal is that the employee was eligible for the PD when one of the two DFF (both the DFFs have HRC_YES_NO as value set) has 'Yes' as assigned value, AND the other flexfield has no assigned value. In order to perform this solution, we configured the Fast Formula you can see in the screenshot, however this FF does not allow us to achieve our goal.