Unsupported Feature: DueDateForSalesInvoice
This error can occur as we unfortunately do not support default due dates for Sales invoices on companies integrated with Sage 50UK&I.
If you notice this error after trying to publish an invoice you will need to check your Company Settings to make sure you do not have a default due date selected.
You will find your Company Settings on the left hand side of your company homepage
You will then need to scroll down to the Sales section of Accounting Settings. If you have a Default Due Date set, you just need to change it to "Not Required" and make sure you save the changes!
Then all you need to do is re-publish your sales invoice!