Cancelling a batch payment is done by using the Cancel Batch Payment button []. This can be done at any stage prior to posting.  

If the batch is approved, the cancel button will ask if you want to unapprove the batch, returning the status to New. It will have a second popup asking if the user wants to further cancel the batch, which once cancelled, the batch will be removed from the list and a new batch payment will need to be made to replace the cancelled batch. 

Once a batch has been posted, but not completely processed, and remains in Part Paid status, the cancel button won’t work. But the batch can be closed by using the Complete Part Paid Batch button [] which will complete the batch and remove it from the open batches list: 

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