Can A Change Rule Be Used For An Autopay Employee?

The client has a situation where salaried autopay employees need to reside on the employee master in one Home Business Unit, but charge to another.  They setup and tested using a change rule that is run after prepayroll has been run and the autopay timecards created. They then run the change rule, the system is updating the system generated autopay timecard with the correct business unit and puts the payroll into a changes only prepayroll.  Is this the correct process for handling this situation or will there be issues that perhaps the client has not thought of?

Thank you for your help!