Answer / guest

Cause: After a subtype was defined as NOT NULL, it was used
as the base type for another subtype defined as NULL. That
is not allowed. For example, the code might look like
DECLARE SUBTYPE Weekday IS INTEGER NOT NULL; SUBTYPE Weekend
IS Weekday NULL; -- illegal instead of DECLARE SUBTYPE
Weekday IS INTEGER NOT NULL; SUBTYPE Weekend IS Weekday;

Action: Revise the subtype definitions to eliminate the
conflict.

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