sork96
Auto-translated
honestly, if we forget that a caravan in Heroes is a cart, I would say that the caravan is moving...
Added 2 minutes ago
oh, lol, if the caravan is moving, then "transfer" is a suitable translation, but I still don't know the situation; if we're talking about blocking the path, then the caravan cannot pass.
AHAAHAHAHA why did you say that, haha 
now I also think that if the caravan is a "creature" in Heroes, then it can indeed be translated
oh my god, where did we end up
UPD: and regarding the situation, this message "it is impossible to transfer the caravan" appears if the caravan cannot enter the city (I haven't checked regarding blocking the caravan's path on the map; in my test map, it takes 1 day to reach it :D, maybe there is the same message). but if it has reached the city, but cannot enter it because all creature slots are occupied and it has nowhere to unload, then it says that "it is impossible to transfer the caravan"
"Я слишком часто имел дело с идиoтами, чтобы к троллям были какие-то претензии" © Дийкстра (The Witcher 3)