MRP Safety Stock Calculation not performing as desired

Hi,

We are using "MRP Planned %" in MPS but it is not calculating the way we want especially for items that have demand for a limited time (e.g. promotional Items).

The issue is the calculation for the safety stock in a week is using the demand in that week and does not recalculate when the demand is zero.  This causes us the following problems:

1. the MPS plan suggests producing more than is needed
2. the excess production shows as inventory going on forever (making it unsuitable for inventory budgetting)
3. we want to have a little stock on hand before the first demand week but the first planned order happens in the same week as the first demand