Char type is chang into 'object' type

1.set up a connection
2.right click Procedure and create new procedure
3.Input procedure name and click add to input parameter ,then select SQL type as Char ,click ok.
4.Input java function name ,then click ok.
5.right click Procedure and click edit procedure
6.select the prarm and click edit button
6.modify the sql type as :CHARaaaaaa
7.Click ok and click cancle
8.In edit procedure ,the param type is still the original one.(This is correct ,because click cancel button)
9.In edit procedure ,then click cancel or ok button.
10.right click Procedure and click edit procedure again ,the param type is chang into 'object'