Found a couple of behavior issues with Input Variables Section.

1) Selecting different Operations in tree on left, does not clear out input variables from previous selection.

• If you select an interface, then re-select an operation the input variables seem to be correct.

2) Re-selecting an Operation after removing (de-selecting) input variables and SAVING re-adds the Input variables and dirties the model.

• This should probably not auto-edit an operation's SQL and input variables just on selection.