Posting a Sales Invoice with 500+ invoice item lines

Hi,

When posting a sales invoice with 500+ invoice item lines to the endpoint "/sales_invoices" the invoice is being created successfully in Sage, however, the response to the Post request is the following Bad Request:

 

- Bad Request 400 - The backend has not responded within 28s while proxying this request. Please try again later. (Proxy)

Any help on this one would be very much appreciated.

I am using Sage Business Cloud Start

Regards,

-Paul.