When you attempt to publish an invoice from your Purchases or Sales folder to Sage Accounting (South Africa), you may see the following error message.
The remote server returned an error: (400) Bad Request.
This error occurs when either:
The unit quantity on any invoice line item is anything other than 1
The invoice description is greater than 100 characters
📎NOTE: Sage South Africa doesn't accept either of the causes above. The same error shows if the values differ/exceed the limit.
To clear the error you need to check every line item's unit quantity and ensure the description field contains no more than 100 characters.