how to reference entitytype field in a transaction saved search?

Journals have a Name field that pulls from the Entity Name, if one exists.

We have a Saved Search where we are pulling multiple transaction types into one combined list. Depending on the type, we want to populate a “Combined Name” field. It works great, except we have a secondary condition for Journals.  If the Journal is related to a Customer/Project we want to leave Combined Name blank.

We’re using a formula field to achieve this:

CASE

WHEN {type} = ‘Bill’ THEN {vendor.entityid} || ‘ ‘ || {vendor.altname}

WHEN {type} = ‘Bill Credit’ THEN {vendor.entityid} || ‘ ‘ || {vendor.altname}

WHEN {type} = ‘Expense Report’ THEN {employee.entityid} || ‘ ‘ || {employee.altname}

WHEN {type} = ‘Journal’ AND ___________ THEN ‘ ‘

ELSE {name}

END

We need help with the underscore above. Obviously the type = Journal, but we can’t figure out how to determine whether that Name field on the Journals is related to a Customer or not. There is an entitytype field on Journal Lines in the Records Browser, but we get a “field not found” error in the formula. Or maybe try to use customer.entity.id.

Whatever can link us from the Journal to the Entity.