What is the search strategy to find out delivering plant automatically?

The following is the search strategy used to determine the delivering plant:

• Firstly, it checks whether a specification exists in the customer-material info record.
• Secondly, it checks in customer master record of the ship-to party
• Thirdly it checks whether a specifications exists in material master record.

If nothing is found, then no delivering plant is set in the sales document item.