What is the difference between CRD and CKD within Edit PI and should I say YES to recollate the PI memberships?

Collating PI Data (Resetting Discounting) Click the CRD button on the Edit PI Data page. If this option is selected, all manual Discounting ticks recorded in the Performance Results grid are discarded on collation. Only the automatic Discounting rules are applied. Collating PI Data (Keeping Discounting) Click the CKD button on the Edit PI Data…