When sending Kadena assets, you must have enough balance in the source chain. If you have enough total balance distributed among multiple chains, but not enough in the source chain itself, you will not be able to send the desired amount immediately. You must combine enough balance in a single chain before sending.
For example, say my wallet has 10 KDA on each of the chains 0, 1, 2, 3 and 4 to a total of 50 KDA. With this distribution it's not possible to make a transaction sending more than 10 KDA yet. If for example I want to send 45 KDA, I must first combine a total of at least that amount in a single chain. I can send KDA to myself from chains 1, 2, 3, and 4 all to chain 0, combining all funds in a single chain. Then there will be enough balance in a chain for such a large transaction.