>>>but problem is that when I extending the material on plant 2000 only for 1000+10+10 system also extend it on 1000+20+10.<<<
I hope this behavior was not just because of April 1st (April Fool day) .
It is not possible to have sales views created for 2 sales organisations at the very same time in MM01, you would need to execute MM01 twice. If that really happened then you are not using SAP standard transaction to create material masters.
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