Poblem importing DB full backup

[cfreire]

I have solved thus:
This is the correct:
"CREATE TABLE t1 (
ts TIMESTAMP(6) DEFAULT CURRENT_TIMESTAMP(6) ON UPDATE CURRENT_TIMESTAMP(6)
);"
This is not permitted:

CREATE TABLE t1 (
ts TIMESTAMP(6) DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP(3)
);

Thank you very much.