Field help (BPCGRUCOD) 

Parameter used to define, for this entry transaction, if the customer group must be : ? hidden: The field does not appear on the entry screen but the default value is attributed to it. ? displayed : The default value is allocated to the field and displayed but the value is non-modifiable. ? entered : The default value is allocated to the field and displayed. It can be modified and in this case, the value entered is controlled in the customer file. The default value assigned is the group customer code associated with the customer in the order in the record of this latter.