实现M002 V3 P0.1 Parent Group路由修订
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# Fix Charge
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## 适用业务
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Fix Charge 是 New Booking 或 Update Booking 的附加收费维护事项。它不是独立业务事件。
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## 触发
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只有当前证据包含可分离的复合单价或附加费组件时才识别,例如:
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- `2000THB+500`
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- `1800THB+500`
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- `2000THB*2` 后接 `+附加500*2`
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不得仅因普通房型或普通价格存在就触发。
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## 解析
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- `+` 前组件用于 Rate Code / settlement price。
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- `+` 后组件是 additional fee candidate。
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- 不得把 `2000+500` 合成 `2500` 判断 Rate Code。
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- 不得自行计算 quantity 或 total amount。
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## 输出字段
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```json
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{
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"fix_charge_required": true,
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"fix_charge_items": [
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{
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"charge_type": "fixed_charge",
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"amount": null,
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"currency": null,
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"pricing_mode": "unit",
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"unit_basis": null,
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"quantity": null,
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"total_amount": null,
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"raw_text": "",
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"evidence_source": "",
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"requires_followup_tool": true,
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"followup_tool_name": "create_or_update_fix_charge / TBD"
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}
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],
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"additional_operations": [
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{
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"operation_type": "create_or_update_fix_charge",
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"status": "pending_target_id"
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}
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]
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}
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```
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## New Booking
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New Booking 的 Fix Charge 操作必须等 reservation/group/block 目标存在后再执行。
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## Update Booking
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Update Booking 场景必须确认 current action 是 add、update 还是 cancel Fix Charge。目标或动作不清时人工复核。
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## 人工复核
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- 无法分离 base room price 与 additional fee。
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- additional fee amount 不可读。
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- 多个价格组件无法归属。
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- Update action 未说明 add/update/cancel。
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- 目标订单不清或系统上下文阻塞。
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