"We were unable to process your submission because we already have a submission with this submission ID"
This message typically appears where a business has multiple employing entities set up and an identical ABN has been used for two or more of these entities. The ATO believes this to be a duplicate lodgement which will cause the lodgement to fail. To resolve this, you will need to ensure all affected employees are transferred over to the one common employing entity. This is done via the employee's Tax File Declaration screen. If you require instructions on this refer to the following article: Updating Employee Tax File Declaration