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This classification presupposes that specification of a legal cause is admissible.
The theoretical question is whether a cause can be fully realized while its otherwise expected legal effect is blocked by a recognized impediment. One approach allows this possibility and describes a completed cause whose effect is restricted by an obstacle.
Another approach maintains that when the complete effective cause is present, the ruling must follow. On that analysis some apparent impediments must instead be located in the formation or completion of the cause. The disagreement concerns the logical relation between cause and legal effect.