SAP Message VK301 - Units of measure differ in the condition record and in the statistics

Diagnosis For rebate settlement, you attempted to settle a rebate condition whichwas defined on the basis of the unit of measure. The unit of measure inthe condition record differs from the unit of measure in the statisticsrecord. It is therefore impossible to determine the rebate value. System Response This inconsistency was caused by a system error during the maintenanceof the rebate conditions. Procedure It is necessary to recreate the statistics for the rebate. (CustomizingRebate -> Tools). If the error still occurs, contact your SAPconsultant or the SAP Hotline Service.