If a salary is to be paid through a XXX organization to an employee.

In company settings, Payments tab, make sure the box With reason of payment is checked :

Create the organization in References - Bank & third-parties :

Go to Employees - Employee management - open the employee - Salary data - Banks tab :

Indicate the payment organization in the field "Bank*. Indicate the IBAN account of the payment organization. In the payment reason, indicate the references requested by the payment organization.