We recommend that in order to reverse a purchase ledger invoice that has been posted, a negative purchase ledger invoice is posted (instead of posting a credit note).
When doing this, please ensure the same purchase ledger analysis codes are used on the negative purchase ledger invoice as were used on the original purchase ledger invoice.
Furthermore, please post the values as negative values (rather than positive values).
Note: Please also ensure the reversing entry is posted into the correct accounting period. Entries cannot be posted to closed periods.