Hi Matt.
If you don't re-valuate your PM Orders, the Sender Cost Center of the Activity is also don't re-valuated, so the Balance isn't '0'.
I think Your Flow must be:
1. KSC5: Indirect activity allocation. At this time, you post activities at plan cost to the PM Orders. At this time Activities Credit your Cost Center. You can see the efect in report S_ALR_87013611
2. KSS2 / KSII: Calculate the Actual Activity Rate ($/h), based on Accounts that debit the Cost Center, and the qty of hours reported. Do you calculate the rate manually in order to confirm is correct? Report KSBT
3. KON2: You re-valuate the activities charged to PM Orders, using the actual rate. At this time the sender cost center are also re-valuated, have balance 0 if everything is OK.
check again S_ALR_87013611 and KOB1 in order to verify the new values.
4. KO88: Settle Maintainance Orders their final destination.
5. If the Service flow is trigger, (the balance in report S_ALR_87013611 changed, and is not cero) you must run KSII again. After that, evaluate again report S_ALR_87013611 and your Balance is Cero again.
Arturo.