Hi Ujjal
I think this is the standard requirement in food or pharma industry.
It´s not possible in the SAP standard solution but you require to come up with work around.
In my earlier project, we use to calculate the stock i.e. ZS i.e. stock getting expired in six months and use to put this as additional demand in the SNP planning book. This would assure that respective stock is getting netted off with additional demand which you have created but for this you require to some easy and simple enhancements/programs.
Please let us know if this could be solution for your scenario.
Thanks
Amol