If that example was used with vertical extensibility, the extended member "Patch Product" would be a problem given it is being attached to an inherited parent. This would be a problem in the summary cube, as other than Entity type dims, you cannot store data in a parent member ("Patch Product" would try to summarize to "Total Product").
With horizontal extensibility, as it would appear is the case in your example, it should not technically be a problem. Comparative reporting isn't really clean, but that might not matter. However, what are you going to do if "Patch Product" turns into a real product for which you then have Actuals data? At that point you do have a problem.