Difficulty Establishing Relations in the API

Hello, I am trying to develop a flashcard platform. When the user clicks on a subdeck, the API copies all the original flashcards linked to the subdeck and creates the user’s progress data. I am having trouble establishing a relation automatically. Currently, I can only do it manually. Below are the current configurations.
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Hi @Pedro_Giovanini_Lopes,

Can you provide the AppId, container name, and page where this issue is reproduced? Also, write steps to reproduce the problem.

Regards,
Bohdan