251217:1704 Docunment Number: Update to 1.6.2

specs/09-history/2025-12-17-document-numbering-v162-alignment.md

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+# 2025-12-17: Document Numbering Specs v1.6.2 Alignment
+
+**Date:** 2025-12-17
+**Type:** Specification Refactoring
+**Related:** REQ-009-DocumentNumbering
+
+---
+
+## Summary
+
+ปรับปรุง specification files ของ Document Numbering ให้สอดคล้องกับ Requirements v1.6.2
+
+---
+
+## Changes Made
+
+### Updated Specifications
+
+| File                                                  | From   | To     | Key Changes                             |
+| ----------------------------------------------------- | ------ | ------ | --------------------------------------- |
+| `05-decisions/ADR-002-document-numbering-strategy.md` | v2.0   | v3.0   | Version refs, compliance links, history |
+| `04-operations/document-numbering-operations.md`      | v1.6.0 | v1.6.2 | Status→APPROVED, file paths fixed       |
+| `03-implementation/document-numbering.md`             | v1.6.1 | v1.6.2 | ADR reference fixed                     |
+
+### New Task Files
+
+| File                                                  | Purpose                       |
+| ----------------------------------------------------- | ----------------------------- |
+| `06-tasks/TASK-BE-017-document-numbering-refactor.md` | Backend implementation tasks  |
+| `06-tasks/TASK-FE-017-document-numbering-refactor.md` | Frontend implementation tasks |
+
+---
+
+## Key Decisions
+
+1. **Single Source of Truth**: `document_number_counters` เป็น authoritative counter system
+2. **Counter Key Structure**: Unified to 8 fields (project, orig, recip, type, sub_type, rfa_type, discipline, reset_scope)
+3. **Number State Machine**: RESERVED → CONFIRMED → VOID/CANCELLED
+4. **Deprecated Tokens**: `{ORG}`, `{TYPE}` replaced with explicit `{ORIGINATOR}`, `{RECIPIENT}`, `{CORR_TYPE}`
+
+---
+
+## Next Actions
+
+- [ ] Execute TASK-BE-017 (Backend team)
+- [ ] Execute TASK-FE-017 (Frontend team, after BE ready)