In Hanafi legal reasoning, commencement of certain voluntary acts makes completion binding. Jurists discuss this as the binding effect of initiation.
This does not turn all voluntary worship into universal obligations. Rather, the person had a choice before commencement; after undertaking the particular act, completion—and make-up upon invalidation—acquires legal force.
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Kitab al-Sawm: Interrupted Voluntary Worship, Puberty and Conversion
In Hanafi legal reasoning, commencement of certain voluntary acts makes completion binding. Jurists discuss this as the binding effect of initiation.
This does not turn all voluntary worship into universal obligations. Rather, the person had a choice before commencement; after undertaking the particular act, completion—and make-up upon invalidation—acquires legal force.