@SuperTramp:
So could you explain in the same situation (map) when i can’t load ,transport and unload ship in one combat move turn.
1. When the ground units are from another nation to the Transport.
You can transport allied units, but they load and unload on their own turn, whilst the Transport moves on its turn.
2. If you had to clear the SZ as it was unfriendly and you failed to eliminate all enemy ships, the cargo(the ground units) would remain on board, without being able to unload.
3. You could also not unload if your Transport is not escorted by a Warship and the SZ from which you want to unload contains an enemy Submarine.
There are probably other occasions too. A Rules Deputy or another member may think of another.
Please keep asking if still unsure. There are many who can help you.