To submit an invoice on SY:

1. Click on Customer Invoices.
2. Click Submit.
3. Select the customer to be invoiced.
4. Specify the company issuing the invoice, if applicable.
5. Specify the establishment issuing the invoice, if applicable.
6. Click Browse.
7. Upload the document.
8. Validate by clicking Submit Files.

The document will be sent to Cegedim for review. You will receive a notification when the electronic invoice is available on the portal for validation.