Can not create master detail relationship on a custom object in Salesforce

Hi Kumar,

If records are present in the objects,

then you can not create Master Details relationship.

However,

you can create Lookup relationship between then,

connect all records and then convert the "field" to Master Details relationship

Hi Kumar,

As we know in Master Detail relationship parent is compulsory, but records which are already created doesn't
have a parent, so you can only create a lookup relationship and then convert it to Master Detail.

Hope this helps.