Hello,

Here is the test case:

CREATE DOMAIN TID AS INTEGER NOT NULL;
CREATE TABLE ENTITY (ENTITYID TID, ALLOTHERFIELDS TID,
CONSTRAINT PK_ENTITY PRIMARY KEY (ENTITYID));

SELECT RDB$NULL_FLAG FROM RDB$RELATION_FIELDS
WHERE RDB$RELATION_NAME = 'ENTITY' AND RDB$FIELD_NAME = 'ENTITYID'

Returns 'NULL' if executed on FB153 server and
Returns '1' if executed on FB201 server.

Why? Was that done intentionally?

Thanks,
Glebas