How can I edit a posted class transaction if the wrong amount was entered?

Posted transactions can only be edited at the family level, individually (Family record > Transactions tab using the pencil icon). It is not possible to edit a batch of transactions all at once. 

If you have mass posted a class fee and need to edit it you are better off deleting the batch (Transactions menu > Delete Transactions) and then re-posting it with the correct amount.

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