Next date in sales order, how to change it? if change it does it triggres

Quick and simple question... what can change a Sales Order Next Date (field VBAK-CMNGV)?? it got changed for one of my Sales Orders according to the changes log via VA02, but no idea how... as I can not see the field via VA03.

Appreciate any help in this regard,

Next date in sales order, how to change it? if change it does it triggres credit check

Thanks

Krishna