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GDE should however implement the following 2 requirements:
1) Diagram is locked In this case, a user can only scroll, open any prop sheets in read only mode, open current symbol options read-only, navigate, etc. A user must not be able to edit, move, delete or add any symbol. TBD menu entries need to be deactivated.
2) Symbol is locked Prop sheet and current symbol options can only be opened read-only, no rename. The symbol (reference !) can however be deleted from the diagram.