Requested Date for MRP vs. Requested Date for production

It would be very usefull, if there would be a (global) factor, where the requested date in the poduction order can be decoupelt from the demand date in the MRP. 

E.g.:

In the production order the demand date of the material is the 25.06. 

In the MRP the planned shipdate for the purchase order will be also the 25.06.

So when printing the PO we will tell the supplier, that we want to have the material on the 25.06.

At the moment it is not possible to say, that I want to have the material 3 days before the demand date that comes from the work order. 

This function should work similar to the "Average delivery time", where you can set a factor between the sales order demand date and the work order ship date. 

(http://portal.beascloud.com/docs/help/online_eng/index.html?berechnung3.htm)

Kind Regards

Harald Bauer