MPMLink & Windchill: Synchronize attributes between the different part structures / BOMs

[MorganBelais]

Some attributes can be modified by different actors with different value in different BOMs.

It leads to introduce customizations to re-conciliate xBOMs where necessary
- Need to have some flexibility: one attribute can be modified into mBOM (e.g. make or buy) but has to be updated in other BOMs

It should be nice if we have :
- Ability to define in which view an attribute can be modified
- Ability to define to which views this attribute must be synchronized

[GregoryPERASSO]

Or Enhance the ERPMaterial to iterate all the Views (from upstream to downstream) of the "Enterprise Branch" when updating the equivalence link

Or Enhance the ERPMaterial object to be "Versionned".