Shipping Method LOV is null in Edit SR -> Part Details tab

Summary:

Edit SR → Part Details (tab) → Create a new SAC, choose a SAC with Business Process as Depot Repair Logistics. The Shipping Method LOV for Shipment Service Activity does not show any value, though I can see many values in OM for this field. In other Instances for the same customer, I can see the values.

Content (please ensure you mask any confidential information):

I am working in a project for many months now and not faced this issue in other PODs. But facing the issue in this POD. When I create a new SR for an asset, go to Part Details tab and add SAC for Depot Repair; under the Shipment Service Activity, you get a Shipping Method LOV field. This field is blank