SLA rule- Derive IC segment from Supplier Type (Internal Supplier)

Summary:

This is my first time setting up SLA rules so hopefully I can explain it well.

What I have done so far is to configure an SLA Mapping Set that derives the IC segment based on the Supplier Name. The setup works as expected; however, it requires manual maintenance whenever a new Internal Supplier is added because we need to update the mappings.

We need to derive the IC segment dynamically for suppliers configured as Internal Suppliers.

Currently, we cannot find an SLA source or supplier attribute that identifies whether a supplier is marked as an Internal Supplier and can be used in SLA Account Rules.