Here you can enter or select the fax number to which the invoice should be sent. You can register several fax numbers per customer. By default, the fax number is taken from the first fax number row registered on the customer.
The fax number can also be used via fax integration* to create a fax printout using a fax program, which can be selected with the setting Fax program for direct fax during form printout? under the section Fax / E-mail under the System tab in the Settings.
* This integration is a Supplement to MONITOR called Fax Integration which must be purchased separately.