What is the difference between the endpoint Invoice and the endpoint SalesInvoice?

If you select the Entity you will see the Invoice one is the AR Invoices and Memos (AR301000) and if you select the Sales Invoice it is the Sales Invoices (SO303000). 

Thank you. This is what I was looking for.
I still can’t get my head around the difference. In the instance I am working on, those 2 screens appear to present the same information.

Hi @rcreasy 
 

The AR Invoice, also known as the Customer Invoice or Sales Invoice, is a document generated by a business and sent to its customers to request payment. This invoice is created by the seller to bill the customer for a specific transaction.

Include below fields.

• Invoice number
• Date of the invoice
• Description and quantity of goods or services provided
• Unit price and the total amount
• Payment terms (e.g., due date, discounts, late fees)
• Customer information (name, address, contact details)

  
  The SO Invoice, also known as the Sales Order Invoice, is a document generated based on a sales order. A sales order is created when a customer places an order.
  Include below fields

• Sales order number
• Date of the order
• Description and quantity of goods or services ordered
• Unit price and total amount
• Customer information (name, address, contact details)