This error is occurring as the Termination Reason is missing from the Employee Masterfile > Details screen for an employee terminated in this batch. To resolve this error:
You will need to enter the Termination Reason code and the Previous Employee Status in the STP Setup menu in your Attaché Online organisation. If the employee is terminated, the Termination reason code can be entered from the Employee Masterfile on the Details tab, but the Previous Employee Status can only be entered from the STP Setup menu in Attaché Online.
As an administrator user, log into your Attaché Online organisation.
Navigate to the STP Setup menu.
Select your company from the Select Company drop down box.
Click the Terminated employees Setup tab.
Enter the relevant Termination Reason Codes and Previous Employee Status values and save the updates.
Go back to Single Touch Payroll and the batch will have now changed from ATO Rejected status to Ready to Submit status.
Re-submit the STP batch.