This is a bit of nagging issue. We have defined PR release strategy with MRP Controller as one of the characteristic. As there is a restriction by SAP, that we have to use only one class for release strateby, we have to share the class with another division. They are using MRP controller as one of the criteria for release strategy, but for us MRP controller is not a criteria. If I did not assign any values to MRP controller in the classification, SAP assumes that I have assigned a value of blank. To over come this I have to assign all the MRP controllers to that classification. If it is a one time excercise it is ok. This has to be checked each time MRP controllers are created or assigned to a plant.