Availability check works from the application from which it is checked, be it sale order, production order etc etc where the checking group come from the material master nd rule from the application. . so if you have the safely stock present, not just defined, at the time of check this stock is considered. MRP is planning for procurement, in OMI1 you can define how much percentage is available for planning; within this threshold , it will not create order proposal but once it crosses, it plans for the entire quantitiy. pl see the IMG help associated with OMI1.
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