The client customer module maintains customer details prior to becoming a debtor.
The customer details are maintained by the salesman who may not have access to the debtors module.
A salesman uses the customer file to records details such as visit, catalogue, physical address details etc.
The existence of a customer will allow a salesman to send a quote but not create a sale or a job without being a debtor.
A customer record must exist before a debtor record can be established.
If the user has access to the debtor system then the customer details are copied to a new debtors master record.
The customer address details must be the physical address for the salesman to visit (not the PO box).