PLW-07202: bind type would result in conversion away from column type

Question

Got this error, "PLW-07202: bind type would result in conversion away from column type", when compiling in the stored procedure editor.
CREATE OR REPLACE
procedure test_proc (at_incoming varchar)
as begin
insert into test2(itemname) values (substr('1234',1,2));
end;
The table test2 was created like this:
CREATE TABLE "DMSCO"."TEST2"
(     "ITEMNAME" VARCHAR2(30),
     "ITEM2" VARCHAR2(10),
     "ITEMNUM" NUMBER(10,0)
Removed the substr, and it compiles.
CREATE OR REPLACE
procedure test_proc (at_incoming varchar)
as begin
insert into test2(itemname) values ('1234');
end;
In sqlplus it compiles fine even with the substr.

Answer 1

PLW-07202: is a warning. There's a bug that it's showing as an error.
-kris