diff --git a/src/main/java/com/vmis/interfaceapp/controller/VehicleInterfaceController.java b/src/main/java/com/vmis/interfaceapp/controller/VehicleInterfaceController.java
index b02ce11..46680fa 100644
--- a/src/main/java/com/vmis/interfaceapp/controller/VehicleInterfaceController.java
+++ b/src/main/java/com/vmis/interfaceapp/controller/VehicleInterfaceController.java
@@ -115,7 +115,6 @@ public class VehicleInterfaceController {
                                                 {
                                                   "VHRNO": "12가3456",
                                                   "LEVY_STDDE": "20250101",
-                                                  "INQIRE_SE_CODE": "1",
                                                   "VIN": "KMHAB812345678901"
                                                 }
                                               ]
@@ -211,7 +210,6 @@ public class VehicleInterfaceController {
                                                   "CPTTR_LEGALDONG_CODE": "1111011700",
                                                   "ROUTE_SE_CODE": "3",
                                                   "DETAIL_EXPRESSION": "1",
-                                                  "INQIRE_SE_CODE": "1"
                                                 }
                                               ]
                                             }
diff --git a/src/main/java/com/vmis/interfaceapp/model/basic/BasicRequest.java b/src/main/java/com/vmis/interfaceapp/model/basic/BasicRequest.java
index 16915b7..4c44665 100644
--- a/src/main/java/com/vmis/interfaceapp/model/basic/BasicRequest.java
+++ b/src/main/java/com/vmis/interfaceapp/model/basic/BasicRequest.java
@@ -47,7 +47,7 @@ public class BasicRequest {
     @JsonProperty("LEVY_STDDE")
     private String levyStdde;
 
-    @Schema(description = "조회구분코드 {1:열람, 2:발급}")
+    @Schema(description = "조회구분코드 (자동설정: VHRNO not null → 3:자동차번호, VIN not null → 2:차대번호)")
     @JsonProperty("INQIRE_SE_CODE")
     private String inqireSeCode;
 
diff --git a/src/main/java/com/vmis/interfaceapp/model/ledger/LedgerRequest.java b/src/main/java/com/vmis/interfaceapp/model/ledger/LedgerRequest.java
index fd874cc..f335998 100644
--- a/src/main/java/com/vmis/interfaceapp/model/ledger/LedgerRequest.java
+++ b/src/main/java/com/vmis/interfaceapp/model/ledger/LedgerRequest.java
@@ -72,7 +72,7 @@ public class LedgerRequest {
     @JsonProperty("DETAIL_EXPRESSION")
     private String detailExpression;
 
-    @Schema(description = "조회구분코드 {1:열람, 2:발급}")
+    @Schema(description = "조회구분코드 (자동설정: 1:열람 고정)")
     @JsonProperty("INQIRE_SE_CODE")
     private String inqireSeCode;
 
diff --git a/src/main/java/com/vmis/interfaceapp/service/RequestEnricher.java b/src/main/java/com/vmis/interfaceapp/service/RequestEnricher.java
index d017952..d902759 100644
--- a/src/main/java/com/vmis/interfaceapp/service/RequestEnricher.java
+++ b/src/main/java/com/vmis/interfaceapp/service/RequestEnricher.java
@@ -14,6 +14,9 @@ import lombok.extern.slf4j.Slf4j;
  * - INFO_SYS_ID, INFO_SYS_IP, SIGUNGU_CODE
  * - CNTC_INFO_CODE (service specific)
  * - CHARGER_ID, CHARGER_IP, CHARGER_NM
+ * - INQIRE_SE_CODE (automatic based on business rules)
+ *   - Basic: VHRNO not null → 3:자동차번호, VIN not null → 2:차대번호
+ *   - Ledger: Always 1 (열람)
  */
 @Slf4j
 @Component
@@ -38,6 +41,14 @@ public class RequestEnricher {
             req.setChargerId(sys.getChargerId());
             req.setChargerIp(sys.getChargerIp());
             req.setChargerNm(sys.getChargerNm());
+
+            // 자동차 기본사항 조회 시 INQIRE_SE_CODE 자동 설정
+            // VHRNO(차량번호) not null → 3:자동차번호, VIN(차대번호) not null → 2:차대번호
+            if (req.getVhrno() != null && !req.getVhrno().trim().isEmpty()) {
+                req.setInqireSeCode("3");
+            } else if (req.getVin() != null && !req.getVin().trim().isEmpty()) {
+                req.setInqireSeCode("2");
+            }
         }
         log.debug("[ENRICH] basic: applied INFO_SYS_ID={}, INFO_SYS_IP={}, SIGUNGU_CODE={}, CNTC_INFO_CODE={}",
                 sys.getInfoSysId(), sys.getInfoSysIp(), sys.getSigunguCode(), cntc);
@@ -56,6 +67,9 @@ public class RequestEnricher {
             req.setChargerId(sys.getChargerId());
             req.setChargerIp(sys.getChargerIp());
             req.setChargerNm(sys.getChargerNm());
+
+            // 자동차 등록원부(갑) 조회 시 INQIRE_SE_CODE는 항상 1(열람)로 고정
+            req.setInqireSeCode("1");
         }
         log.debug("[ENRICH] ledger: applied INFO_SYS_ID={}, INFO_SYS_IP={}, SIGUNGU_CODE={}, CNTC_INFO_CODE={}",
                 sys.getInfoSysId(), sys.getInfoSysIp(), sys.getSigunguCode(), cntc);