JBO-25013: Too many objects match the primary key null
i Encountered This Error while i was trying to change an attribute in the selected row (selected by the user on the screen), and there was an Alternative Key on that iterator view/entity, setting/changing that attribute i wanted to change would make that Alternative Key repeat, which triggered that error, after removing that Alternative Key, the error no longer appeared and there was no error.
so just remove the Alternative Key and try again, it should work smoothly.
source: i got it from this topic ( the last answer by the person who asked this question )
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