[SOLVED] Can't attached version to component

Hi,
Here is my problem using V7.0.9
I create a Component A and create a version for it
I create another component B and create also a version for it

Looking at my components, I've got the version properly set.

Then I said that B component is a Component "used by" A component.
Then I click on my A component.. B component is properly show as "component used...".
Now I click on my A component version specification to "attached" the proper version of B component to this specific Version of A and then click on "list of component version used by this version" and I select the version of my B component and press "select element".

Here I always as the same problem, saying "invalid control / This like already exist .
Knowing that I never attached component B version to Component A version, I don't know HOW this link could already exist.. By the way, if it exists, it is not shown on the component A version sheet...

Where does it go wrong... ?? right now I can't manage to attached "version to version" which is a big pb

Thanks for your help

Regards

Please Find attached Some ScreenShots. When you will see the structure of my component..

The Flat Structure of my component is well displayed with all the version (even if I didn't make any links !!!) (image PB1)

When I click on the Production version link, no versions of SUB components on this component version are displayed (PB2 -> my " ? " tag ^^)
When I click on " add a product version structure" and choice the 2 versions of my Sub components that I want to use for this component Version and then press "valid" . I've got a 'link already exist" message...

Thanks for your help again to understand what is goin' on

I've update to V7.1.2 And I can fully attached Versions as before...

Solved with the new version

MY BAD !!
It seems that It occured again... sometime I can properly attached "sub-components versions" to "component version" ... sometime I can't ...

very strange problem