Ok, that makes sense.

Under the following scenario:

User 1 adds 4 detail lines
User 2 adds 3 detail lines
User 2 saves changes.
User 1 attempts to save but is not able to because header record has
been changed by user2 save.

Since everything for user1 would rollback, they would have to reenter all detail lines
again. Is that correct?

Thanks again.