SAP Message 06813 - Please check conversion factors in the conditions

Diagnosis
The system cannot compute the conversion factor for the conditions inall cases.
Affected in this case is info record &V1&, purchasing organizationV2, plant v3, info category v4.
If the condition unit of measure corresponds to either the order unitor the order price unit, re-computation is possible.
If the new condition unit of measure corresponds to neither the orderunit nor the order price unit, no automatic re-computation is possible.
In this case, you must maintain the conversion factor of the conditionsmanually.