its not a good idea to change status of order.
if you want to do it forcefully do following
1) take a backup of Transactional DB. also note down amounts of trail balance
2) update status of order from SQL Server (it will skip related methods or any pre-post events)
3) add your missing line in ax
4) go back to SQL server and verify the newly added line, by comparing it with existing lines. this is needed as you are creating line manually, so must be sure that any references are not missing.
5) revert back status of order, which you changed #2. do again on sql server
6) Post your intercompany order,
7) verify your Trail balance and posted Vouchers