You can add a custom validation to fail payment request creation in head office if there is already an existing payment request with same Reference number (XBLNR), transaction amount (PAMTF), transaction currency (PACUR) & payee which is still not reversed (XREVE is blank).
Alternatively, while reversing payment document in subsidiary, check for status of payment order it created originally in IHC. You can find Subs company code + payment document number in AWKEY in IHC_DB_PN table and then read the status. If the status is "D4" then allow reset and reversal of payment document else not.