LineItems: DiscountRate returned but DiscountAmount does not depending on invoice call query

[timwiel]

The lineitems field DiscountAmount should be returned in any response that also returns DiscountRate as they both apply equally to a lineitem.

Current Behavior

When a call is made to a single invoice the lineitem fields DiscountRate and DiscountAmount are both returned in the lineitems object HOWEVER if a call is made that retrieves a summary then only the DiscountRate is returned.

The API documentation states (see https://developer.xero.com/documentation/api/accounting/invoices#get-invoices) that when multiple invoices are returned then either no lineitems are returned OR a summary is returned depending on the invoice query.

I have verified this behaviour using the following:

• Returns DiscountRate but NOT DiscountAmount on lineitems:
  • Using PHP SDK call to $result = $apiInstance->getInvoices($xeroTenantId,null,null,null,"{$invoice_guid1},{$invoice_guid2}",null);
  • Using Xero API Explorer using the GetInvoices with comma seperated query IDs
  • Using Xero API Explorer using the GetInvoices with page query
• Returns both DiscountRate and DiscountAmount:
  • Using Xero API Explorer using the GetInvoice with one invoice GUID specified
• Returns empty lineitems field:
  • Using Xero API Explorer using the GetInvoice with createByMyApp set to 1

Expected Behavior

The API should return lineitems with DiscountRate and DiscountAmount as documented for a call that returns multiple invoices if the lineitems field is populated

OR the API documentation needs to be updated with a specific breakdown of what lineitem fields are returned in a summarised response ... which would be all fields EXCEPT validationerrors and DiscountAmount which seems a bit strange why only those two would not be returned.

[github-actions]

PETOSS-429

[github-actions]

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