It is assumed that each of warehouses is set as Customer master "N01" and Vendor master "S01". When you create a purchase order from a sales order , it is always selected to Customer master warehouse "N01". However, User would like to set it to Vendor master "S01" in some cases. So, please consider to add a feature to pop up window of selecting a wherehouse in creating a purchase order from a sales order .

Ideas Administrator

Appreciate you taking the time to feedback. We however do not have any plans to provide this support for SCM Procurement and Sourcing.