I haven't played with OpenInteract, but I have played with SPOPS, which is the database layer OpenInteract is based on, and personally I found it rather undocumented, and not entirely bugfree. (For example,

$g = SPOPS::DBI->fetch(1);
$f = SPOPS::DBI->fetch(1);  # same as $g
$f->{field} = "oldvalue";
$g->{field} = "newvalue";
print $f->{field}; # prints "oldvalue"!
# now you have to guess which will be saved first :-(
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)

andramoiennepemousapolutropon