use Optimistic locking or else its not possible for two users to work on same case simulatenously, its near parallelism not exact parallelism. If you really want to have to two users to work in paralell , u can create child cases and use dont lock parent check box option.

Hi Raghavendra,

Do you mean that the two sub cases that are split for the main case, when worked by two other users are trying to update the main case and getting lock exception? Kindly elaborate.

If so, as suggested you could use "Optimistic locking" and the user who first commits the changes on the main case would acquire the lock on the parent and the second user would be prompted to refresh the case as the changes are already committed by other user. 

If possible, please share the logs to get the exact failure point. 

Can someone please share similar real time example for  Spin off ,Split join & Split-for-Each" ?

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