SAGE help needed please!

Hi Could anybody help me with this please? I posted an item from a suppliers invoice to Suspense account (9998) and I now want to allocate it to where it should be - Rent - and for the amount to show as a creditor in the suppliers account. I have tried editing / deleting the transaction but I can't as it says the VAT return has been reconciled (although it was T9 and not included). How do I move this please? At the moment it shows on the P&L as an item but strangely does not appear as a creditor in the suppliers account. I need it to be moved to Rent and for it to show as outstanding to that supplier as we still owe it to him - any advise you can offer would really help me. Many thanks - Ruth