Hi,
We are also experiencing the same issue. Can anyone explain what is going on?
In case if that helps anyone, this issue happens where some larger company files are unable to have data posted as the API will return an "IncorrectRowVersion" error. This is a known issue in MYOB API.
The workaround they've mentioned was Try unticking the "Warn for Duplicate" preference in AccountRight which is found under the Setup menu > Preferences > Sales.
This means that you will have to manually check for invoice numbers inside AccountRight to ensure there are no duplicates.
