[GNC] New Bill: Bill ID vs Billing ID

[Fran_3]

In 7.10.1 are the field definitions for a New Bill from a vendor... two of them are...

Invoice Info - Invoice ID (optional) - the identification number of the invoice as emitted by the vendor (IE: the vendor’s internal number for this invoice).
Billing Info - Billing ID (optional) - the vendor’s ID for the bill (e.g.: their invoice #).
This is confusing to me as follows...
On Bills we receive from vendors we often find a number on the document we use to identify it...1 - Vendor's Bill Number
 
along with the the dates often found on the document... like...2 - Date the vendor created the Bill3 - Service Period Dates
4 - Due Date
We consider 4 above to be the Billing ID in 7.10.1 above... aka the vendor's ID for the bill... aka their invoice #
So what is Invoice Info - Invoice ID  in 7.10.1?
Thanks for any clarification.