When I use "demote" now, the constrains of the parts in the new sub assembly are related to orgin of the master assembly. The result is a lot of dubble unnessary constrains in de master assembly, I must remove them. In the sub assebly is the result that the parts which were constraint to the origin, are free now!
Ther is a very easy solution for this problem if the software engineers of autodesk, move the constrains related to the origin of the assambly to the new sub assambly origin when choice "demote".
master assembly after demote
No constrains in sub assembly, parts are free!