Agree with Nitin and Swetha.
"Controlling the Rejection" is a very generic term. Elaborate your business process first
.
You may reject material but actually you do not "control" rejection in SAP. Though you may take decisions to control rejections based on reports generated by SAP.
Kindly read this Blog ; http://scn.sap.com/community/getting-started/blog/2010/05/12/asking-good-questions-in-the-forums-to-get-good-answers
it will be appreciable if you could Re-phrase your question after reading this blog.
Amol.
