The 100t TEA Tankers from the Cargo Line Volume 1 pack by Skyhook cannot be connected to anything, including themselves. They appear in the initial list but once selected you are unable to duplicate or select anything else to add. This problem applies to all 5 colour variants. (Black, Blue, Green, Grey and Red)
Fortunately the excellent freeware TEA tankers (available on the Hub) are recognised by Formation Designer. For example. Creators Club - 100t TEA (HFP) "less CO2" (Note the above liveries have been applied to the older NTP TEA model). I guess that the Skyhook models might have been too new to be included in the first beta of FD..........however your question/observation is valid and deserves an answer.
