Account Group is Greyed Out in XD01

Hi Expert,

While creating new customer XD01, I am not able to select Account Group from the drop down as it is greyed out by some one.

Is this transaction variant? How can I make edible or can select account group from the drop down? I tried OBD2, OB20 but could not find solution.Please see screenshot for better understanding.

Appreciate if anyone can help me ASAP.

Thanks