diff --git a/include/ProjectDataManagement/pdm_enums.hpp b/include/ProjectDataManagement/pdm_enums.hpp
new file mode 100644
index 000000000..c8fb2aac7
--- /dev/null
+++ b/include/ProjectDataManagement/pdm_enums.hpp
@@ -0,0 +1,13 @@
+#ifndef PROJECTDATAMANAGEMENT_PDM_ENUMS_HPP
+#define PROJECTDATAMANAGEMENT_PDM_ENUMS_HPP
+
+// Minimal placeholder for migration build. Real definitions come from ProjectDataManagement module.
+// This stub allows isolated migration builds; replace with real generated header when available.
+
+namespace ProjectDataManagement {
+  enum PdmEnums {
+    PDM_ENUM_PLACEHOLDER = 0
+  };
+}
+
+#endif // PROJECTDATAMANAGEMENT_PDM_ENUMS_HPP