Description:
On the myob_error property of an order or invoice, the above error is displayedand the invoice may not be synced to MYOB.
Reason:
If the invoice date falls within the date range of a locked period in MYOB then the invoice cannot be synced.
Resolution:
There are a few different ways to resolve this issue.
1. Change the order date so the order falls outside of a locked period
2. Remove the locked period in MYOB
3. Manually add the invoice into MYOB.