When a service request does not include any contractor, the service is supplied on behalf of the direct customer of the current organization.
By contrast, when a service request includes a contractor, the service is provided to the customer but is is made on behalf of the contractor. The customer receiving assistance is not the organization's customer but the contractor's.
Regarding invoicing, the data loaded by default is the contractor's (invoiced customer, pay-by BP, ...). Therefore, it is mandatory to create a customer record for the contractor.
This option makes it possible to discern the contractor population.
This option is also mandatory to be able to link customers to their contractor(s).