Ship method is not automatically defaulting on the Supply request

Summary:

Ship method is not automatically defaulting on the Supply request. Transit time setup has shipmethod.

Content (please ensure you mask any confidential information):

supply chain execution> inventory maangement > item qtys > select the item > create transfer order > enter requested qty> the source org populates automatically however the ship method is not defaulting.
when i click on source org (already defaulted to correct source org) > search > it shows the source org record with ship method on it n when i select that explicitly the ship method is populated on the supply request. after submitting it to create transfer order it still does not show ship method.