you can make assumptions, based on your activities for those materials the assumptions may match 100% or can be just wrong.
Movement 241 is used to post stock from your warehouse to an asset, your warehouse stock could be bought from several vendors on different days, unless you do not differentiate the stock by batch all receipts will just add their portion to a total and you can't find out in SAP from which vendor or date it was, you can just assume. I explained that in How old is my stock / from which vendor is my stock