Hi Lynkoeurs, It's not with a real bp that I arrive, it causes me no problem actually. It's more for personal culture:
As written in the title, I regularly have purple ribs. Only it seems random. I snooped around in the properties of the document, ditto in the system properties. But I couldn't find anything.
The purple color indicates that the dimension is marked so that it will not be imported into a drawing.
Double-clicking on the dimension and ticking the dimension icon (last on the right), in the pop-up window that opens, so that the dimension becomes black again.
This imported MEP dimension can then modify the model.
On a dimension of the imported MEP, double click on it and modify the dimension: the volume model is modified, there is associativity between the model and the MEP.