Wants to activate batch management for a material which already had a Stock

hi,
i want to activate batch management for a material which already has a stock and open Purchasing documents.
is there any way by which we can do it without removing the same.
please help.
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program name is RVBCONVMAT2BM
but i am doubtfull it will be delivered with standard SAP, you need to request you from SAP as they charge for this.
this program convert the material to batch and all relevant dependant documents will be updated with batch no.
Regards,
Pravin Mukkawar
pasting  some description of the program
REPORT rvbconvmat2bm.
Report illustrates the call of function module VBZ0401_CONVERT_OBJECTS
which sets the batch management flag for one material including
depending objects. Function module VBZ0401_FILL_BUFFERS helps
improving the performance.
then logic......