Currency
The currency of a customer must match the currency of the group. Specify group-level currency settings in Customer Master Group Setup-General.
The currency setting is used to determine if a Customer Setup record can be linked to the group. You cannot add a customer to an active group if the customer's currency is different than the group's currency.
After a customer has been linked to the group, the currency of the group or customer can be changed while the group is active.