Hi Cyprien,

Thanks for your comment. This is Iván from Mews Support.

Mews allows you to issue (credit) invoices as well as proforma. However, the settings are not default, you'll need to select this option for the specific profile -either company or customer.

For companies, you'll navigate to the Company profile > Additional info tab > Options (bottom-left) > Invoiceable. Don't forget to hit Save. 

After completing the above, you should see the following options in the Billing screen:

I hope you can make it work, please come back if you need further information.

Best,

Iván

Hi ​@Cyprien ,

to create an invoice as a customer, you must make the company billable. 
As we work with the German translation, I can only send you the corresponding screenshots. You can find the point under Additional information/ Options:

Don't forget to save ;-)
 

Now, you can create an invoice in the invoice window that shows a correct invoice number and VAT

I hope you can follow this in your own mews.

Best regards

Leif

P.S.: oops, too late.. ;-)

Great ! Thanks !

Where can I all my issue invoices ?

HI ​@Cyprien, The Bills and invoices report has everything you need. If you need an overview per company, you will find all invoices in the dashboard of the profile.  
Regards, Sanne