Merge pull request #1438 from codatio/sage200

Add Sage 200 limitation for invoices

docs/integrations/accounting/sage200/sage200-limitations.md

@@ -76,3 +76,7 @@ Total amounts and total tax amounts are shown for each line.
     "note": "0000000126"
   }
 ```
+
+## Invoices
+
+When working with Sage 200 Standard, the inline discount is applied directly to the final transaction amount. This means that the discount amount is not stored or available as a separate value in Codat. Instead, the system incorporates the discount into the total calculation without retaining it as a distinct field. As a result, both `lineItems.discountAmount` and `totalDiscount` will be returned as null.