Accounts Payable Manual Payments Confusion

["Barb VanEe" <vaneeb@xxxxxxx>]

>I have a situation in which a user made a mistake entering manual payments
>into A/P.
>For those type of payments invoices are entered with the same invoice
>number (they use posting date as invoice number). The checks are typed and
>the payments are manually entered.  The mistake was made when an amount
>entered from one check was allocated to another vendor.  The amounts were
>not the same.
>They tried to correct it by entering another invoice with a suffix and
>then posting the amount to the new invoice.
>Then they tried to void the payment without success.  Then they tried to
>revise the payment in the next batch, again without success.  Then they
>tried to add payment in a third batch and by this time a user in another
>departmant got involved and cancelled batch 2 and 3 from the session manager.
>When these batches were cancelled, it didn't un-do  the A/P files
>updating.  All it did was to prevent G/L from being updated.
>Is there a way I can un-do this?
>Thanks for any suggestions.