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Exam Certified Platform App Builder topic 1 question 480 discussion

Actual exam question from Salesforce's Certified Platform App Builder
Question #: 480
Topic #: 1
[All Certified Platform App Builder Questions]

Universal Containers (UC) has a custom Invoice object and a custom Invoice Line Item object. The Invoice Line Item object has a lookup relationship to the Invoice. UC would like to convert the lookup relationship to a master-detail relationship but is unable to do so.

Which two reasons could be preventing this relationship conversion? (Choose two.)

  • A. There are already two master-detail relationships on the Invoice Line Item.
  • B. Invoice Line Item records exist without having the Invoice lookup field populated.
  • C. Custom objects are unable to be on the detail side of a master-detail relationship.
  • D. There is a roll-up summary field on the Invoice object.
Show Suggested Answer Hide Answer
Suggested Answer: A 🗳️
by wlthorn at Feb. 1, 2023, 4:15 p.m.

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igorshpak
Highly Voted 2 years, 2 months ago
Selected Answer: A
A B for sure!
upvoted 8 times
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sfreesway
Highly Voted 1 year, 11 months ago
Just in case anyone is wondering: The current relationship between the 2 objects is lookup, you can only make a rollup sum field on objects with a master-detail relationship so it cant be D We all know you can make roll ups on custom objects so ofc cant be C either You cant have more than 2 master details fields per object You cant change a lookup into master detail if any of the child object records don't have data in that field like wIthorn said below So the 2 answers have to be A & B
upvoted 5 times
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SHK1207
Most Recent 9 months, 1 week ago
Correct answer is A & B
upvoted 2 times
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IcyKyoX
2 years, 3 months ago
This is 2 possible answers question type. In my opinion second good answer should be B
upvoted 2 times
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wlthorn
2 years, 3 months ago
When converting a lookup relationship to a master-detail relationship, all detail records must have a related master record. If there are records without a populated lookup field, the conversion will fail. Additionally, when a master-detail relationship is established, the detail object cannot have a roll-up summary field, so the conversion will fail if there is a roll-up summary field on the Invoice object.
upvoted 2 times
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wlthorn
2 years, 3 months ago
B. Invoice Line Item records exist without having the Invoice lookup field populated. D. There is a roll-up summary field on the Invoice object.
upvoted 1 times
igorshpak
2 years, 2 months ago
D is wrong. You cannot create roll-up on look-up, only master-detail.
upvoted 5 times
sfreesway
1 year, 11 months ago
Yup there cant be a roll up already on the field as they haven't converted it yet
upvoted 1 times
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