Can you use some more words to explain the business case and your goal? I can read and understand the words but unfortunately not the sentence and how stock determination corresponds to purchase requisition creation.
maybe you just took wrong words, here is the explanation for stock determination https://help.sap.com/saphelp_erp60_sp/helpdata/en/eb/64bd534f22b44ce10000000a174cb4/content.htm
You see, its all about goods issues.
if you want a warning message then you have to program it yourself in a BAdI or exit.
However, this would also mean that you more or less have to replicate what the MRP run does to give this some sense, otherwise such message, if wrong or meaningless, will soon be very annoying to the users.
Just looking at the current stock level may not really be good at all. What if your vendor needs 20 days to deliver you? Don't you drink any coffee in that time? If the user doesn't create the PR just because today you have enough stock then you may run out of stock until someone else thinks about reentering the requisition. You would need to consider future demand which is eventually already entered, or check reorder points.
If you track inventory then the best use of SAP is to maintain the right planning parameters in your material, to record the goods issue right on time and to run MRP to get the requisitions. No extra effort or even ABAP programming needed.
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