I am getting the error cannot update erased record occasionly when
running this query on firebird 1.5:

"delete from vorder where vosession=? or
((vodatetime+1)<current_timestamp)"

The table vorder has a few thousand recodrs in it at any one time.

Does anybody know what this error means?

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CREATE TABLE VORDER (
VOKEY INTEGER NOT NULL,
VOSESSION CHAR(32),
VIKEY INTEGER,
VODATETIME TIMESTAMP default current_timestamp
);