Hi Althea,
I dont think you can achieve this without postings to fiancials (finance books).
we had similar issue in the past.
we had some production orders,WIP/Variance calculated,but didn't settled for some reason and those orders were from previous fiscal year.in standard sap we can't settle/reverse previous year orders in current year.so we implemented an OSS note.
Note 424139 - Cross-year settlement
After implementing the OSS note,we settled all previous year WIP/Variance calculated orders to current fiscal year and closed the orders.
Hope this helps you.
Thanks,
Rau