Fusion CST Sub Inventory input source in mapping set is working for only certain events

Summary:

For our customer requirement, they are operating in 900+ Locations (Defined as SUB INVs), so for that we need to derive the Costing SLA for Location segment (One of the COA Segment). When we define the input source as Sub Inventory code, it works only for the selected event class, but we need that for all the events, which is not currently available (Generic to all classes).

We tried with other source option of Source SubInventory, but that does not work for any of the events.

Content (required):

So we need to achieve the Costing Location SLA segment based on the SubInventory code of that particular transaction.