Hanafi law distinguishes the obligatory minimum Qur’anic recitation from the wajib specification of Fatiha; omission of the latter may require sujud al-sahw.
In Shafi‘i law, Fatiha itself is a pillar of each relevant rakah, so a missed pillar cannot simply be replaced by prostrations. The schools interpret the Qur’anic command and Fatiha-related traditions differently.
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Prostrations of Forgetfulness: Causes, Method, Missed Sittings and Doubts
Hanafi law distinguishes the obligatory minimum Qur’anic recitation from the wajib specification of Fatiha; omission of the latter may require sujud al-sahw.
In Shafi‘i law, Fatiha itself is a pillar of each relevant rakah, so a missed pillar cannot simply be replaced by prostrations. The schools interpret the Qur’anic command and Fatiha-related traditions differently.