الموانع أربعة أقسام
Impediments fall into four categories.
CategoryWhat is blocked?Formation of the causeIts operative constitutionCompletion of the causeThe remaining elements needed for full operationCommencement of the rulingThe ruling taking effect initiallyContinuation of the rulingPersistence of an established effect
A jurist must determine which stage is interrupted. Simply observing that a legal effect fails to appear does not explain whether the cause was never constituted, remained incomplete, was barred from operating, or ceased to retain its effect.