Hi,
This message appears when you have stocks, open purchase requisitions, open PO's and any other open documents for the material...so you need to close all this open documents and remove the stock also then only system allow you to activate batch management for the material.......there is no way you can bypass it. by the way for how many materials are you trying to activate batch Management..if materials are more then use the following link to activate the same..
http://scn.sap.com/docs/DOC-5532
Thanks
Kumar