We have the ability to sort by "Exhibition catalogue number" and by "Publication reference number" however, when you select the feature the numbers appear as: 1, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 100, 101, 102....

It would be useful if they could appear in numerical sequence: 1, 2, 3, 4, 5, 6