hubieren observado
-they/you will have watched
Future perfect subjunctive ellos/ellas/ustedes conjugation of observar.

observar

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En general, los actos procesales serán nulos solo cuando no se hubieren observado las disposiciones expresamente prescritas, bajo pena de nulidad.
In general, procedural acts will be nullified only where the requirements expressly set out, on pain of nullity, have not been met.
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