Ruleset : Parallel execution

Summary:

Rulesets are created with nested rulesets enabled for parallel execution

Content (required):

I want to run ruleset, enabling parallel execution tick. some of the rules launch successfully while some fail with "Essbase could not get a lock in the specified time.

Those rules have the same fix area, but calculated accounts are different. When i contacted support they said it is due to "block contention which can be caused which would mean that one rule would not be able to get a lock within a specified wait time"

Have anyone experience this? and was able to find a work around?