Performance document drop down is blank while checking eligibility of an employee

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Hello,

while wanting to check if an employee is eligible for the performance document and to process it , under check eligibility after selecting correct review period and employee name i am still unable to find the performance document which is supposed to show up. The drop down appears blank and when i try to change the effective date also then the whole filed is blurred out. How can i get the drop down values ? even after when there is active performance document present.

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