Key value locking in Online 5.x

Hi all, as i remember there are problems with the so called "key value locking" mechanism in Online 5.x Under some circumstances, it is possible that you can't insert a new row into a table (where one row was locked) even if the key of the new row differs from the key of the locked row. Small tables are a good choice for the problem. Is there a solution for the problem in Online 6.x and 7.x ? Greetings, Joerg