plpgsql constraint checked data fails to restore

I have a database running 8.0.1

One of the tables uses a plpgsql function as a
check constraint. There is data in the table that
passed the constraint.

The problem comes when trying to restore the
database using a file created by pg_dump.

Some of the data required by the check function
is being restored after the data being checked
by the function and so it all fails the constraint.

I have a small (200 lines) dump file which shows
the problem if that will help.

Is there a way to ensure that the checked data
gets listed last in the dump file? Some other
way?

I actually have this database deployed on 7.4.x
so a fix that also works for that series would be
ideal...

Thanks for your time.

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