I have the same issue with the [materialUpstream] column, which references back onto functionTable[functionName], which has [functionName] as the label.
Every forum post and article I can find says that the Ref should show the label column of the referenced table, but that isn’t happening here. What am I missing?
A Ref type column’s value for each row must match a value from the referenced table’s key column. It looks like your Ref columns contain values from the referenced tables’ Row ID columns but at least the sectionTable has a different column designated as the key. Either designate the Row ID column as the sectionTable’s key or change the values of the functionTable’s [section] column to match values from the sectionTable’s sectionName column.
You likely can’t if you configure the reference within the database. To accomplish that, you’d have to manage the reference solely within the app’s table configurations.
Regardless, my suggestion is to rely on the Row ID column as the table key.