Default DFF Using UDT in Autocomplete

We are creating an Autocomplete rule to default Position DFF using values from a UDT.

The example logic is as follows -

If Department is HOSPITAL BASED PHYSICIAN then default Position's Entity Type DFF to "6 Clinic"

Else derive Entity Type DFF from the UDT based on Business Unit

The UDT shows Business Unit as rows and Entity Type as column. Values would show the Entity Type to default into the Entity Type DFF on the Position.

For example, if Business Unit is "101 Hospital" then the value to derive from the UDT is "1 Medical Surgical"

This is the Autocomplete rule that we have created. What is the best way to reference the UDT table to pull in the required value?