diff --git a/versions/sof-0.2.schema.json b/versions/sof-0.2.schema.json
index 9b29eb0..2c67d62 100644
--- a/versions/sof-0.2.schema.json
+++ b/versions/sof-0.2.schema.json
@@ -190,7 +190,13 @@
                 },
                 "subproblem": {
                     "description": "The subproblem in MathOptFormat.",
-                    "$ref": "https://jump.dev/MathOptFormat/schemas/mof.1.2.schema.json"
+                    "oneOf": [{
+                        "$ref": "https://jump.dev/MathOptFormat/schemas/mof.1.0.schema.json"
+                    }, {
+                        "$ref": "https://jump.dev/MathOptFormat/schemas/mof.1.1.schema.json"
+                    }, {
+                        "$ref": "https://jump.dev/MathOptFormat/schemas/mof.1.2.schema.json"
+                    }]
                 }
             }
         }