How to Say "procedural matter" in Spanish
The Spanish word for “procedural matter” is “incidente” — C1 level.
English → SpanishC1
nounC1formal
a legal or bureaucratic dispute or side issue

Examples
El abogado presentó un incidente sobre la validez de las pruebas.
The lawyer presented a procedural matter regarding the validity of the evidence.
La corte debe resolver primero este incidente antes de continuar el juicio.
The court must resolve this side issue first before continuing the trial.
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