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Saurabh Singh 63Saurabh Singh 63 

why I am able to create roll up summary on account to Opportunity.

The relation between Account and Opportunity is "Lookup", but still you are able to create roll up summary field on Account. Why?
Best Answer chosen by Saurabh Singh 63
Jainam ContractorJainam Contractor
Hi Saurabh,

This is one of those functionality which was delivered some time back and is out of the box between the Standard Objects like Account-Opportunity, Account-Case, Contact-Task.

Please have a look at the below this idea link:
https://success.salesforce.com/ideaView?id=08730000000BraS

It was delivered almost 10 years back and is something unusual. Keeping the business requirement in mind it was delivered.

Let me know if it clears your doubt or you need some more explanation.

Thanks & Regards,
Jainam Contractor

All Answers

Ramakrishna Reddy GouniRamakrishna Reddy Gouni
check your installed packages, you might be install declarative rollup summary tool,  will please un install it and check it.
 
Saurabh Singh 63Saurabh Singh 63
I have checked but there is no declarative rollup summary tool installed.
Rakshana Cube84Rakshana Cube84
Hi Saurabh,

Do you have Advanced Multi-Currency enabled on your SFDC.Org?  I'm pretty sure that AMC$ kills all Currency Roll-Up Summary fields.

Thanks,
Rakshana
Jainam ContractorJainam Contractor
Hi Saurabh,

This is one of those functionality which was delivered some time back and is out of the box between the Standard Objects like Account-Opportunity, Account-Case, Contact-Task.

Please have a look at the below this idea link:
https://success.salesforce.com/ideaView?id=08730000000BraS

It was delivered almost 10 years back and is something unusual. Keeping the business requirement in mind it was delivered.

Let me know if it clears your doubt or you need some more explanation.

Thanks & Regards,
Jainam Contractor
This was selected as the best answer