How was it possible for Adam to disobey?

Imām Ibn al-Jawzī (d. 597/1201) summarized the scholars' opinions in his book "Zād al-Masīr" as follows:

1. He was forbidden from (eating from) a specific tree, but then he ate from a tree of the same kind as the prohibited one.
2. He interpreted the prohibition as a dislike (makrūh) rather than as a strict prohibition (ḥarām).