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All I see online is that each object can have 2 master-detail relationships, but on the Salesforce App Limits PDF : https://na5.salesforce.com/help/pdfs/en/salesforce_app_limits_cheatsheet.pdf

It says that custom objects can have 8, what release was this in? I am studying for DEV 401 and I wanted to make sure I knew the answer to this before I take it.

6 Answers 6

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There is only 2 Master Detail Relationship allowed per object and it can have upto three custom detail levels.
You can read more about it here, Considerations for Relationships

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Each object is allowed to have one or two masters, or up to 8 details.

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    Can you tell me where you read that you can have 8 details? Thanks Nov 5, 2015 at 20:23
  • This is not limited to 8, there is no documentation --- can create 10+ without issue Feb 12, 2019 at 18:05
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You can have a Total of 40 Relationship fields with a Maximum of 2 Master Detail Relationships. So you can have all 40 as Lookup Relationship fields, 38 Lookup and 2 MD 39 Lookup and 1 MD relationship fields on an object.

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Answer is 2 master-detail relationships on an object. The purpose of this note is the reminder that the limits are placed on the child object. Pretty obvious on an ER diagram; w/o ER in mind I for one will sometimes confuse where the limits are applied.

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Just created 4 master-details relationships, so it is certainly possible for a master to have more than 2 relationships.enter image description here

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    That's a different situation. Each object cannot be the detail side of more than two master-detail relationships.
    – David Reed
    Sep 10, 2021 at 18:47
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A custom object cannot be on detail side for more than 2 Master-Detail relationships. It means any custom object can be involved in maximum 2 Master-Detail relationships as detail object.

Hope it answers your query!

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