Spain’s LOAC Manual (1996) specifies, among the conditions which must be fulfilled for the lawful taking of reprisals, that the action must cease once its objective has been met.
Spain, Orientaciones. El Derecho de los Conflictos Armados, Publicación OR7-004, 2 Tomos, aprobado por el Estado Mayor del Ejército, División de Operaciones, 18 March 1996, Vol. I, § 3.3.c.(5)(a).