On the ATV630 and ATV930 process drives, why can't the digital input assignments be changed?

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Issue:
ATV630/ATV930 the digital input assignments are not changing in the Input/Output menu?

Product Line:
Altivar Process, Altivar 630, ATV630, Altivar 930, ATV930

Environment:
All models

Cause:
Attempting to change DIx assignments in the COMPLETE SETTINGS > INPUT/OUTPUT menu

Resolution:
The digital input assignments in the INPUT/OUTPUT menu are read only. To change an assignment, you need to go to the desired function and then assign an Input to the function. Example: to assign Reverse to DI2, you need to go to "Reverse assign" in the Command and Reference menu, and change that to DI2.

Link to the ATV600 programming manual: https://download.schneider-electric.com/files?p_Doc_Ref=EAV64318
Link to the ATV900 programming manual; https://www.se.com/us/en/download/document/NHA80757/