A true modification is a modification which physically changes the part or changes some of its properties.

A true modification is detected if the code, the description, the part number, the complementary part number, the manufacturer, the manufacturer part number, the comment, the contain of representations or publishings change in a part. As well as all parameters of the Material node (available from the Parameters folder in the entities tree)

A modification like rotate or zoom a part is not a true modification.

In the case of a true modification, the revision changes from A to B, otherwise it changes from A(0) to A(1).