Check item is considered for MRP run for sales order item

You need to check your item schedule line in sales order using tcode VA03 to see whether it is considered for MRP run for that particular line item. Your item schedule line must be 'CP' in order to see the sales order in tcode MD04.

Check whether item is ready to deliver in sales order

Go to either tcode VA02 or VA03 and go to schedule lines to know whether stock is already allocated to the item before it is ready to deliver.

Make sure confirm quantity is already in the schedule lines before you are ready to deliver.

Create Customer-Material Information

You can use tcode VD51 to create customer material info record and the customer material data will be populated in sales order.

Tcode: VD51

Tcode: VA03