How to cancel receipt that was entered incorrectly

Summary

Need to cancel incorrect receipt

Content

We have a blanket PO that has 12 lines. For each line is the monthly payment for the service. Every month we have the user gl in and create a receipt for the current month and then our accrual process picks up if there is an invoice for that PO. Our end user accidentally received all the lines, and we need to cancel the receipts or the receipts for some of the lines because the PO accrual generated for the entire year. Is there a way to cancel a receipt that was entered? If not, how do we unreceive for