Cancelling SES Line Item After Invoice and Payment

I americium facing an contented with a Service Entry Sheet (SES) successful our strategy and would admit immoderate proposal oregon solutions. A idiosyncratic has created an SES with 2 enactment items, and 1 of these enactment items has been invoiced and outgo has already been made to the vendor. The idiosyncratic has present realized that the magnitude connected the archetypal enactment point is incorrect and needs to beryllium canceled. However, erstwhile attempting to cancel the archetypal enactment item, the strategy does not let this enactment due to the fact that the 2nd enactment point has already been invoiced and outgo has been made to the vendor. Is determination immoderate solution to resoluteness the incorrect magnitude connected the archetypal enactment point portion keeping the 2nd enactment item, which has already been processed for invoice and payment? Any suggestions oregon champion practices to grip specified situations would beryllium greatly appreciated. Thank you successful beforehand for your help!