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Once a payroll transaction has been processed you are unable to make changes to the account coding of that transaction. If you do need to make changes you would be looking at deleting the transaction and reprocess correctly. You can delete a payroll transaction in AccountRight via selecting that transaction and going to Edit>>Delete Payroll transaction. Do note that you can't delete a payroll transaction in a previous payroll/financial year.
Alternatively, a quick workaround would be to record a journal entry to take the value off the incorrect correct and then move it into the correct account. You can create a journal entry via Accounts>>Record Journal Entry. You mentioned that the transaction you wanted to change was March, personally, I would recommend a journal entry as it occurred in a previous payroll year, however, there may be some impacts to the current financial year. As such I would recommend speaking to an Accountant in relation to the impact of recording that journal entry.
Do let us know how you get on and if you require further assistance.