I was creating, or modeling, some hydraulic hoses inside one of our pieces of equipment. Within the assembly, I brought in the crimp ends and placed them where I wanted them. Then I inserted a new part so that I could build the hose body portion. Once I had everything the way I wanted it, I created a new subassembly so that I could group the three components together.

Right away, I get mate errors - everything was fine up until I created the subassembly...but I trooped on. I opened the file so that I could fill out the data card and save it as the correct naming convention. The hose body is not shown. The ends are there, but the hose body isn't there. The hose body is greyed out in the feature tree as id it is suppressed and it has the yellow warning sign showing. So, I hover over it to see what the warning is.

"This component is created in a future version" - ok, maybe not a direct quote, but only because I can't remember the exact wording used - but it is the same thing.

I am using 2017 Sp 4.1. We have 18 but haven't installed it yet. So, how is it that I just created something that I won't create until later???