To update records forcefully in table you can use doupdate method with tablename. Following example is helpful to understand this thing .
InventTrans _inventTrans;
;
ttsbegin;
while select forupdate _inventTrans where _inventTrans.RecId == 5637152999
{
_inventTrans.inventDimId = '123213';
_inventTrans.doUpdate();
}
ttscommit;