safety time is not working in ePP/DS

Hi,

we use PP/DS and  realize that the safety time is not working or better say the product heuristic SAP_PP_002 is not considering the safety time of 3 days.  The safety time and method are maintained in the product master, but the purchase requisition that should be brought forward by 3 days before the requirement, is not doing it. The pur req is still generated at the same date and time as the requirement element. period factor is 0.

have a good day!

Walter

what might be the issue?