Restrict invoice from printing if finance document is not created during invoice creation

If you dont want to allow user to print out invoice which finance document is not created during invoice creation using tcode: VF01, you may set a routine in the output type as below:

Select rountine as '62' as below.

When a Billing/Invoice document is not fully created yet like below:

Then user is not able to print out invoice and will got the below error:

Maintain Billing Due List

If sales order which already over due and havent bill customers yet, you may use tcode VF04 to view those outstanding billing which havent bill yet.

The billing date is calculated based on the billing date in Sales Order as below:

VF04 printscreen: