If you want to invoice project invoices together with media invoices, you have to activate a parameter in Media/Parameters/invoicing. The invoicing is made in the media invoicing part and in the project invoicing part you state on the invoice, which plan the invoice concerns. Create an invoice as normally in Adjusting/Invoicing and connect it to a plan in the tab Parameters.
Check the parameter Include invoices made in PRO in System: Base registers/Parameters, tab Invoicing
