Our typical invoice consists of the following components. We would like to understand from which database does the information flow into the invoice?

S. No.	Details on the invoice	Available in Xero or SF?	Response as per SFX functionality
1.	Our billing entity’s Sales Tax Number (VAT/GST etc), registration number	Xero	From Xero
2.	Our billing entity’s company name & address	Xero	Salesforce & Xero
3.	Customer Name and Full Address, finance contact	Xero & SF	Salesforce & Xero
4.	Invoice Date	The date when the invoices are generated	Yes
5.	Invoice Number	Based on the last previous invoice no. in Xero (different series for each billing entity)	Yes
6.	Reference Field – Opportunity name + PO no.	SF	Yes
7.	Description Line items – Opportunity name + Product name	SF	Yes
8.	Quantity	SF	Yes
9.	Unit Price per quantity	SF	Yes
10.	Discount % on a per line item (per customer)	Xero & SF	Yes
11.	Tax rate depending on Tax rules (per customer)	Xero & SF	Yes
12.	Amount in correct currency (per opportunity)	SF currency is correct as it is per opportunity	Yes
13.	Due Date - Credit Terms	Xero	Yes
14.	Bank Account, Name and Address details (per opportunity)	Available in Xero, but it is as per customer. Since the payment details vary based on opportunity, SF data must be considered here.	Bank Account is a feature of Xero. However, payment captured at Salesforce will be synced to Xero.

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Which database is primarily used to generate the invoices – Xero or Salesforce (SF)?
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From where are the most important data for the invoice pulled from – opportunities & products, pricing?
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