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When the user updates the friction/roughness for a class it should change in all profiles where it's in use. The scope of this change should be contained within the project.
Cross section metadata
Cross sections may change over time (they are periodically updated with new measurements). Therefore it is important to have some "versioning system" for cross sections. At least a cross section used in a calculation should have some meta data attached to it so you know who made it and when it was made.
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