diff --git a/src/schema/rules/sidecars/pet.yaml b/src/schema/rules/sidecars/pet.yaml
index bf2095b1ed..f26782081f 100644
--- a/src/schema/rules/sidecars/pet.yaml
+++ b/src/schema/rules/sidecars/pet.yaml
@@ -41,7 +41,7 @@ PETSample:
     - suffix == "pet"
   fields:
     BodyPart:
-      level: recommended
+      level: optional
       description_addendum: Corresponds to DICOM Tag 0018, 0015 `Body Part Examined`.
     BodyPartDetails: optional
     BodyPartDetailsOntology: optional