By default, the Form Builder stores any changes you made to the form since last saving it, independent of whether the changes occurred in the navigation tree, in the Table Painter, in the Form Painter, in the PC Editor, or in the input fields of the maintenance screen. You can undo these changes step by step. And, after undoing, you can also redo the changes.
For this function, the Form Builder must store intermediate states of the form. This happens whenever you pressRETURN or call an application function.
Under Utilities ® Settings on theGeneral tab, the option Undo/Redo Form Changes must be marked, which is the default.
After calling one of these functions SAP Smart Forms re-compresses the nodes in the navigation tree. Otherwise the Form Builder would have to store the exact state of the navigation tree after each action. This would result in extensive losses in performance when working with the Form Builder.