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Carolina W 2Carolina W 2 

How can I select “AccountTeamMember” in the Summarized Object in create field?

I'm trying the create a Roll Up Summary Field that use the TeamMemberRole, but I can't see the name of the Object in the options (see the pic).
Somebody told me that I have to create a field type Master Detail Relationship to do it...But is there another way to do it without creating a useless field?

User-added image
Best Answer chosen by Carolina W 2
Carolina W 2Carolina W 2
Unfortunetly, I can't create a  Master-Detail relationship field using a Standard Object... So, consequently, I can't create a Roll Up Summary Field.

What I did: installed the Roll Up Helper in AppExchange and its works! 

Thanks @Priya

All Answers

PriyaPriya (Salesforce Developers) 
HI Carolina,

A Rollup Summary field is used to calculate the sum of a fields in the child object record. It is compulsory to be in a Master-Detail relationship to use the rollup summary. A rollup summary field is always created on Master record.(Parent to Child).
 

Please mark as Best Answer so that it can help others in the future.

Regards,

Priya Ranjan


 
Carolina W 2Carolina W 2
Unfortunetly, I can't create a  Master-Detail relationship field using a Standard Object... So, consequently, I can't create a Roll Up Summary Field.

What I did: installed the Roll Up Helper in AppExchange and its works! 

Thanks @Priya
This was selected as the best answer