Dear Team,
In PO at the time of creation of items, if RSP is going to lesser then the WSP, as per price chart, it should show a pop up message for that item, right now in desktop it is allowing to create less than RSP also, if it blocks there it self user will change the RSP and MRP.
I Think right now no developments going in Desktop, if you people are developing in web also look in to this for reference, and do the needful.