Looking for help on finds the material Item field name/ table in maintain router

I am trying to do a crystal report that I need to pull the field that is"material Item"(SEE THE YELLOW HIGHLIGHED  that is located in Maintain Router, Detail, then material. The Operation type is

 Outside Processing.  Does anyone know the table or view that contains this field and what the name of this field is called All I see is key fields rather than ID fields.

Thank You!!!