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i.e. it returns 'SalesOrd' and not 'salesorder'

al3xicon: Instead of using nlapiLookupField, I used this function:
'''function get_ent_record_type(id) {
            return search.create({
                    type: search.Type.ENTITY,
                    filters: ['internalid', search.Operator.ANYOF, id]
                })
                .run()
                .getRange({
                    start: 0,
                    end: 1
                })[0]
                .recordType
        }'''
where id is the entity record internal id.  You could adjust it for transaction.