diff --git a/app/models/concerns/metadata/unused_values_concern.rb b/app/models/concerns/metadata/unused_values_concern.rb
index 79cdbe65..a6f8aa54 100644
--- a/app/models/concerns/metadata/unused_values_concern.rb
+++ b/app/models/concerns/metadata/unused_values_concern.rb
@@ -19,8 +19,10 @@ module Metadata
 
           disabled = false
 
+          # El campo está deshabilitado si está completo y no incluye el
+          # post actual.
           if inverse?
-            disabled = p[inverse].empty? || ![p[inverse].value].flatten.include?(post.uuid.value)
+            disabled = p[inverse].present? && ![p[inverse].value].flatten.include?(post.uuid.value)
           end
 
           [title(p), p.uuid.value, disabled]