Hi Anders,

For normal purchased parts (not multisite planned ones) all lot sizing attributes comes from Inventory Part Planning Data,

But as you may know, purchase requisitions are generated in the ‘main’ step of MRP and the generation of purchase requisitions uses same date logic as when you manually create Purchase Order Lines basically. So last order date of the the PO Req Line is calculated using the primary supplier’s lead time data and the supply chain matrix.

Best Regards,

-Mats