Known issue only on R18 CMS supervisor, that the Registry Key for Report Path will be overwritten with default values under repositories for PCCOWCustReport after supervisor restarts.
Workaround solution: Need to duplicate the acsCheckRegistry.exe file or rename it under C:\Program Files (x86)\Avaya\CMS Supervisor R18 .
You can simply create the copy of it and the try with the new path under repositories for PCCOWCustReport
HKEY_CURRENT_USER -->Software-->Avaya-->Supervisor-->18.0-->Repositories , it will not change after this.