interbase 4.1 blob fields?

When I try to create the following table interbase gives a strange
error:

create table x
(
  test blob sub_type 1
);

I get an error:

Error: Subtype 21 (text) not found.

then when i create the following table it goes ok:

create table y
(
  test blob
);

and again, this goes wrong:

create table z
(
   test1 char(2),
   test2 blob
);

Same error as above..

Please help me converting from local IB 4.0 to 4.1

Thanx

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