Why can't we create a master detail relationship? (The 3rd reason)

Why can't we create a master-detail relationship?

1. Some reasons are, but what is the 3^rd reason, Like-

         a) Salesforce will not accommodate a master-detail relationship to a custom object that 

             already contains data.

         b) You can create a maximum of 2 master-detail relationships.

               

The situation which I face -

2. I have only one master detail relationship on an object. But I'm not able to create a new master-detail relationship on the same object.

Guess Why....

Let's know the situation with an example -

3. I have another object named “Test B” where an MD relationship of the object “Test A”.

>> Both the above two reasons are failing here.

So why…

Reason – You can’t create this type of field because a master-detail relationship already exists on this object and this object is the master in another master-detail relationship.

Note – You can show this above conclusion message at that time when you create another MD relationship field on object “Test A”.

This may be helpful to the new SFDC Students…

Thanks for reading my post.