Hello Nachiket,
Please find answers as follows,
- System copies the storage location form planned order at the time of order creation. Release is related to allowing goods movement, confirmation and paper printing.
- If the order is created after the 20 November then for storage location issue check the Item level location in BOM it super seeds the material master location.
- Yes, Planned order is main source of data for production or process order.
Regards,
Shekhar