Why can't I assign a digital input to Command and Reference switching on ATV630?

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Issue:
Why can't I assign 2 compatible functions to the same digital input?

Product Line:
ATV630, ATV660 , ATV650

Environment:
All serial numbers ,

Cause:
Programming Hand Off Auto functionality

Resolution:
Need to verify that the Access Level is set to Expert. Then you can assign 2 different functions to the same digital input.