Editing the Transform List
IMPORTANT:
When you enter a new transform, it is guaranteed to be placed in a valid position in the list, provided you have never edited the list. If you edit the list, you must do so carefully, or you can create a condition where there is no valid position for a new transform. Such a condition may not become evident until after you apply several additional transforms that are all inserted correctly. When you edit the list, you are responsible for making sure that the edited order is valid.
A transform list can only be reordered by selecting insert, then copy/paste, and then deleting the original transform that was copied. If you want to edit the transform list, it can take several steps to complete the editing that you intend. Therefore, recalculation is automatically suspended until you select it. When you edit the transform list, the [Rollback] and [Commit] buttons, which are normally grayed out, become enabled. Some changes are automatically committed and happen immediately after you click add.
When these buttons are enabled, you can continue to edit the transform list, but you cannot enter new transforms for automatic insertion until you click [Rollback] or [Commit].
Evaluation of the transform list will stop if a transform expression is invalid or a transform is out of order.
When any of these situations occur, the [Rollback] and [Commit] buttons become enabled, and you must either abandon the changes or repair the transform list. You can repair the list by modifying, rearranging, or deleting transforms (see“Transform Order”. The basic rule of order is that no dataset variable can be used as an output after it has already been used as an input to a different variable (e.g., normally a 'new' variable, _2, would be created).
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