When trying to send an amount with more than eight decimal places (e.g., 0.123456789 BTC) the user is given the uninformative error message "Error In Amount".
I don't know that the amount should be rounded or truncated, so it is probably correct behavior to reject the transaction attempt, just that there probably is a better error message to communicate what specifically is the problem.
It is the correct behavior, what would you recommend for the message?
"Too Many Decimals. Bitcoin values are up to 8 digits after the decimal."
or something to that effect.
Change ui.cpp:2143 and the relevant original text in all the translations.
This is no longer a problem in the new UI, as the input widget makes it impossible to enter extraneous decimals.
Closing this issue...