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Can a detail object in Master-Detail relationship be made master object in a M-J-M relationship (Master - Junction - Master). My opinion : No.

If answer to above question is No, can we have L1-J-L2(Lookup - Junction - Lookup) relationship and still have detail object in M-D to be L1? Something like M-D and then D(L1)-J-L2. If not, I may have to design my M-D relationship as lookup and have L1-J-L2 relationship for many-to-many set. . Please advise.

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What's the actual question here? Have you attempted to model this relationship structure and run into a problem in doing so? This SFDC article: Considerations for Relationships is probably also worth a read. –  Mark Pond Feb 23 '13 at 0:54
    
Could you draw what you mean and post it here please? That'll probably clarify your question. –  Wes Nolte Feb 25 '13 at 11:22
    
Mark, I attempted to model the same in my org and looks like I can have a detail object as a master in another M-J-M relationship. I was having second thoughts on whether I should design my model this way or have L-J-L relationship instead of M-J-M for second one. But seems like I can have M-J-M relationship. Thanks for the input. –  Vimal Desai Feb 25 '13 at 14:46
    
Wes, as of now I got my answer rectified by crmprogdev and Mark, if I still have any queries, I will try to draw something in detail for this issue and share here. –  Vimal Desai Feb 25 '13 at 14:47
    
Curious to know why this question was downvoted. Although, I think the question had all required details given and I even got answers from Mark and Crmprogdev, I would like to know the reasons on downvote so that I can take care in future. –  Vimal Desai Feb 26 '13 at 14:56
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up vote 2 down vote accepted

@Vimal Desai, as shown in the link Mark Pond gave you, its pretty obvious that it is indeed possible for the detail object to be the master in an M-J-M relationship. Recognize that the "J" object is going to be a custom object and that one of the Master objects will be primary over the other. Based on that, there's no reason they can't both be look-ups from the joint custom object.

If you have any doubts about this, I recommend you create a Dev Org and try creating the type of Master detail arrangement you're looking for.

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Yes Crmprogdev. I tried this in my org and looks like a detail object in M-D relationship can be a master in another M-J-M relationship. Thanks. –  Vimal Desai Feb 25 '13 at 14:44
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