Release 10.1A: OpenEdge Development:
Progress 4GL Reference

EDIT-CAN-UNDO attribute

Indicates whether the widget can undo the last modification.

Data type: LOGICAL

Access: Readable

Applies to: BROWSE widget (column), COMBO-BOX widget, EDITOR widget

If the widget can undo the last modification, EDIT-CAN-UNDO has the value TRUE, otherwise it has the value FALSE.

If you set EDIT-CAN-UNDO to any value, Progress empties the undo buffer.