There seems to be a problem that is affecting the modifyType changesets in MySQL 5.6. These changesets worked fine in MySQL 5.5.
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The column was varchar(255) and this changeset worked fine with MySQL 5.5.
I see new error messages were added to MySQL 5.6
http://dev.mysql.com/doc/refman/5.6/en/error-messages-server.html#error_er_fk_column_cannot_change
which wasn’t there in:
http://dev.mysql.com/doc/refman/5.5/en/error-messages-server.html
So some changes were made. These should be fixed or documented in the modifyType documentation: