Power Designer: Cannot sort partition columns using arrows

Hi everyone!

I'm just trying to sort the partition columns of a table using the arrows in the "General" tab that appears when I double click over the first row in the "Partitions" tab (sorry, I find it difficult to explain...).

For some reason when I press "Apply" (Aplicar) to apply the modification, nothing changes but the partition columns remain in the original order. However, if I apply the same changes by directly inserting the columns in the desired order in the field "Specification" in the same tab (for instance: column_4 = '', column_1 = '') it works.

I would like to know how I could make it work the first way because I think it is easier, faster and less prone to manual mistakes.

(I am still working with version 16.5)

Thank you very much!