Salesrep is the production file with only an index on the idkey (it has more properties than shown here).
Property SalesRepId As %String(MVATTRIBUTE = 0, MVJUSTIFICATION = "L", MVWIDTH = 10) [ Required ];
Property Surname As %String(MVATTRIBUTE = 2, MVJUSTIFICATION = "L", MVWIDTH = 25);
Property Forename As %String(MVATTRIBUTE = 3, MVJUSTIFICATION = "L", MVWIDTH = 25);
. . .
Property FundraiserId As %String(MVATTRIBUTE = 15, MVJUSTIFICATION = "L", MVWIDTH = 20);
Index SalesRepIdIndex On SalesRepId [ IdKey, PrimaryKey, Unique ];