[CM][BUG]In edit table, add class column which name is same as inherit table is error

1 choose one table
CREATE TABLE "a"
CLASS ATTRIBUTE(
"class1" date DEFAULT DATE'06/07/2011',
"class2" character(1) DEFAULT 'f' NOT NULL,
"class3" date DEFAULT DATE'06/08/2011' NOT NULL,
"class4" double DEFAULT 23 NOT NULL,
"class5" blob
)
(
"bb" integer AUTO_INCREMENT(1,3333),
"aa" date DEFAULT DATE'04/06/2011',
"fsd" character(3) DEFAULT 'fds' NOT NULL,
"cc" character(10) DEFAULT 'd '
);

2 create one table;
CREATE TABLE "b"("aa" date)
3 click choose b, click edit table
4 add one column
cc character(10)
class1 Date
5 click ok
6 goto edit table

Expect result.
In table b,will add
instance table: cc character(10)
class table:class1 Date
click inheritance, in resolution, we can change table name which come from a.
Actual result.
instance column cc display the new add.
class column class1 display the inherit column. it's error.