FSXA Cannot Join Problem

Today I ran into this problem. First time I have encountered this problem. As you can see, the two items are selected, but under Part, the *Join* is grayed out. The body and the blade are already animated. Trying to get these pistons animated also.
Using FSDS 3.5.1 and FSX 10. Thanks in advance.


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Resource contributor
That is an odd one indeed. My advice is just to leave them separate, and make one the child of the other.
Problem was with Ambient.. Went back to parts properties and redid part name to piston and part parent to none on both pistons. Once joined, then I was able to have part name as ambient 2 and part parent to ambient 3. Many thanks for the reply