مانع يمنع انعقاد العلة
An impediment preventing constitution of the legal cause.
At this stage, the attempted act never becomes an operative legal ground. Words alone cannot produce a legal result unless the subject matter is legally capable of receiving that transaction.
An incomplete cause can have an initially valid basis awaiting completion; a nonconstituted cause lacks the foundational legal capacity to operate. Subsequent satisfaction of some incidental requirement does not automatically validate a transaction that never validly arose.