[0rph3n]

tratto da:
http://sql-info.de/mysql/referential-integrity.html

3.3. ERROR 1005

[...]

This means either:

* The referenced table is not an InnoDB table
* The referenced column in other_table is not unique
* The referenced column in other_table has a different type to other_id

In MySQL prior to 5.0, this error can also indicate that:

* No index has been defined on the column other_id

buono studio!
'iao