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Use
master grid to the material in the AFS Basic data view. Set the indicator AFS Status to activate the material as an AFS material. Once you have set the indicator you cannot assign another master grid to this AFS material.
coverage strategy to the material in the AFS MRP view. Set the indicator AFS Status MRP to activate the material as an AFS material. Once you have set the indicator you cannot assign another coverage strategy to this AFS material.

You cannot use the AFS material until you have set the indicator AFS status MRP in both the AFS Basic data view as well as in the AFS MRP view.