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plans/training-type-review.md

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+Investigate the "ประเภทการอบรม" dropdown validation.
+
+Current issue:
+The form displays:
+
+"Invalid input: expected string, received undefined"
+
+instead of a friendly Thai validation message.
+
+Tasks:
+
+1. Review the React Hook Form configuration.
+2. Review the Zod schema.
+3. Review the Select component.
+4. Ensure the field is correctly registered.
+5. Ensure the Select binds:
+   - value
+   - onValueChange
+6. Ensure defaultValues contains a valid default or empty string.
+7. Replace raw Zod error messages with Thai validation messages.
+
+Training Type options should be:
+
+- INTERNAL
+  Label: อบรมภายใน (Internal Training)
+
+- EXTERNAL
+  Label: อบรมภายนอก (Public Training)
+
+- ONLINE
+  Label: e-Learning / Online Course
+
+- OJT
+  Label: On the Job Training (OJT)
+
+Validation message:
+
+กรุณาเลือกประเภทการอบรม
+
+Verify:
+
+- Create mode
+- Edit mode
+- Reset form
+- Validation after submit
+
+Return:
+
+- Root cause
+- Files changed
+- Fixed code
+- Regression checklist