IKYO005I PKI CA certificate last used serial number was regressed.
Explanation
During certificate fulfillment, PKI Services has detected that the CA certificate’s last serial number has regressed to a serial number below the next available PKI Services serial number.
System action
PKI Services calls the R_DataLib callable service IncSerialNum function to increment the regressed serial number back to the next available PKI Services serial number or to one that was never used by PKI Services. If this is an asynchronous certificate request, the request is tried again with a new serial number.