How many HACR can run in parallel in SAP BW 3.5 and 7.X?

Hi Experts,
I have a question that How many HACR/attribute change run can run in parallel in SAP BW 3.5 and 7.X?
I know in SAP BW 3.5 only one ACR job can run and if we start any will be failed due to lock issues. On other hand, I also noticed in SAP BW 7.3, there are more than one HACR job running in parallel without lock issue.
Does anybody know the reason behind this? how many ACR job we can run in parallel and precautions to be taken care everything.
Please share your thoughts and lets understanding the ACR in detail..
Thank you.
Bharath S

Hi Bharath,
I' am not sure but I' am sharing what I think
New version is always some betterment of old version. Time changes, advancements in technology, performance improves.
However, I want to ask "Can we run two HACs at a time which use same info object in 7.X ?"
Regards
Nikhil Guda

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