Does CUBRID require to drop constraints before dropping the table constraints are defined in?

I tried the following approach from http://www.cubrid.org/manual/840/en/Constraint%20Definition

I created 2 tables with a foreign key and when I tried to delete the first table an error was received stating that the primary key is referred by a foreign key and is not supposed to be dropped.

However, when I tried creating a table with an INDEX,UNIQUE or PRIMARY KEY constraint, drop table worked fine and deleted the constraint(s) also.

So, basically, if no FOREIGN KEY is set, then cubrid will clean up all the constraints and drop table will work fine. If a FOREIGN KEY is set, then the table with foreign key must be deleted first or the "DROP FOREIGN KEY" command must be used.