Can not Cancel Processing of Message in SXMB_MONI

Hi all

I'd like to clean up some outstanding error messages in SXMB_MONI but when I try to 'Cancel processing with errors' I get a message stating 'Can not cancel XML message with this status/type' The status is 'System Error - Restart not possible' Message no. XMS_ADM108

Can someone tell me how to get around this?

Thanks, Dennis

A total newbie