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lastleg-service/src/main/java/com/baiyue/lastleg/procurement/mapper/ProcurementDirectionMapper.java

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+package com.baiyue.lastleg.procurement.mapper;
+
+import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Param;
+import org.apache.ibatis.annotations.Select;
+
+/** 方向变更只读门禁，购买与收货事实仍归原履约模型。 */
+@Mapper
+public interface ProcurementDirectionMapper {
+    /** 已发生的购买或起运仓事实禁止通过审核切换方向。 */
+    @Select("SELECT EXISTS(SELECT 1 FROM ll_procurement_flow WHERE order_id=#{orderId} AND "
+        + "(purchased_at IS NOT NULL OR actual_warehouse_id IS NOT NULL OR overseas_shipped_at IS NOT NULL))")
+    boolean hasStarted(@Param("orderId") long orderId);
+}

lastleg-service/src/main/java/com/baiyue/lastleg/procurement/repository/ProcurementDirectionRepository.java

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+package com.baiyue.lastleg.procurement.repository;
+
+import com.baiyue.lastleg.procurement.mapper.ProcurementDirectionMapper;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Repository;
+
+/** 采购方向审核的数据访问边界。 */
+@Repository
+@RequiredArgsConstructor
+public class ProcurementDirectionRepository {
+    private final ProcurementDirectionMapper mapper;
+    /** 在订单行锁内读取履约事实，避免改向重解释原始货物来源。 */
+    public boolean hasStarted(long orderId) { return mapper.hasStarted(orderId); }
+}

lastleg-service/src/main/java/com/baiyue/lastleg/procurement/service/ProcurementDirection.java

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+package com.baiyue.lastleg.procurement.service;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.web.server.ResponseStatusException;
+
+/** 采购方向决定起运仓类型，历史两段编码分别代表起运段和目的地段。 */
+public final class ProcurementDirection {
+    public static final String IMPORT = "OVERSEAS_TO_DOMESTIC";
+    public static final String EXPORT = "DOMESTIC_TO_OVERSEAS";
+    private ProcurementDirection() { }
+    /** 旧订单缺少方向时保持原进口流程。 */
+    public static String normalize(String value) {
+        if (value == null) return IMPORT;
+        if (!IMPORT.equals(value) && !EXPORT.equals(value)) throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "采购方向无效");
+        return value;
+    }
+    /** 展示区域随方向切换，不改历史技术段编码和关联。 */
+    public static String display(String text, String direction) {
+        if (text == null || !EXPORT.equals(normalize(direction))) return text;
+        return text.replace("海外", "__ORIGIN__").replace("国内", "海外").replace("__ORIGIN__", "国内");
+    }
+}