diff --git a/src/csv-loader/loader.ts b/src/csv-loader/loader.ts
index f13292a..a2fe4e2 100644
--- a/src/csv-loader/loader.ts
+++ b/src/csv-loader/loader.ts
@@ -352,7 +352,14 @@ function resolveReverseReference(
     currentFilePath,
   );
   const pkStr = String(pkValue);
-  return refTable.filter((row) => String(row[schema.foreignKey]) === pkStr);
+  return refTable.filter((row) => {
+    const fkValue = row[schema.foreignKey];
+    const fkStr =
+      fkValue !== null && fkValue !== undefined && typeof fkValue === "object"
+        ? String((fkValue as Record<string, unknown>)[defaultPrimaryKey])
+        : String(fkValue);
+    return fkStr === pkStr;
+  });
 }
 
 function resolveNestedReferences(