Specification of cost center and group company code from AD and field in booking form as mandatory fields. In addition, we need two extra input fields for "Cost center to be charged" and "Group company to be charged", if this differs from the requester and host. The group company should be selectable via a drop down. If the two additional fields "to be debited.." remain empty, the cost center and group company will be debited from the AD. If filled, this must appear in the report for billing.