diff --git a/WebContent/WEB-INF/classes/com/pms/salesmgmt/mapper/salesNcollectMgmt.xml b/WebContent/WEB-INF/classes/com/pms/salesmgmt/mapper/salesNcollectMgmt.xml
index 29d9831..88733f5 100644
--- a/WebContent/WEB-INF/classes/com/pms/salesmgmt/mapper/salesNcollectMgmt.xml
+++ b/WebContent/WEB-INF/classes/com/pms/salesmgmt/mapper/salesNcollectMgmt.xml
@@ -1490,6 +1490,11 @@ ORDER BY T.REGDATE DESC, T.PROJECT_NO DESC
 	-- 판매 관련 필드들 (sales_registration 테이블에서 가져오기)
 	SR.sale_no AS SALE_NO,
 	COALESCE(SR.shipping_order_status, '') AS SHIPPING_ORDER_STATUS,
+	
+	-- 주문수량 (PROJECT_MGMT에서 가져오기) - 잔량 계산용
+	COALESCE(T.QUANTITY::NUMERIC, 0) AS ORDER_QUANTITY,
+	
+	-- 판매수량 (sales_registration에서 가져오기) - 이미 판매한 수량
 	COALESCE(SR.sales_quantity, 0) AS SALES_QUANTITY,
 		COALESCE(SR.sales_unit_price, 0) AS SALES_UNIT_PRICE,
 		COALESCE(SR.sales_supply_price, 0) AS SALES_SUPPLY_PRICE,
@@ -1625,7 +1630,7 @@ ORDER BY T.REGDATE DESC, T.PROJECT_NO DESC
 	<!-- 모든 분할 출하의 총 판매 수량 조회 -->
 	<select id="getTotalSalesQuantity" parameterType="map" resultType="map">
 		/* salesNcollectMgmt.getTotalSalesQuantity - project_no로 시작하는 모든 레코드의 판매 수량 합계 */
-		SELECT COALESCE(SUM(sales_quantity), 0) as total
+		SELECT COALESCE(SUM(NULLIF(sales_quantity, '')::NUMERIC), 0) as total
 		FROM sales_registration
 		WHERE project_no LIKE #{orderNo} || '%'
 	</select>
diff --git a/src/com/pms/salesmgmt/controller/SalesNcollectMgmtController.java b/src/com/pms/salesmgmt/controller/SalesNcollectMgmtController.java
index fb2e4b9..7d430c6 100644
--- a/src/com/pms/salesmgmt/controller/SalesNcollectMgmtController.java
+++ b/src/com/pms/salesmgmt/controller/SalesNcollectMgmtController.java
@@ -292,13 +292,14 @@ public class SalesNcollectMgmtController {
 		System.out.println("salesCurrency: " + paramMap.get("salesCurrency"));
 		System.out.println("salesExchangeRate: " + paramMap.get("salesExchangeRate"));
 		
-		saleInfo = salesNcollectMgmtService.getSaleInfo(paramMap);
-		salesCurrency = CommonUtils.nullToEmpty((String)saleInfo.get("SALES_CURRENCY"));
-		
-		System.out.println("=== DB에서 조회한 saleInfo ===");
-		System.out.println("SALES_QUANTITY: " + saleInfo.get("SALES_QUANTITY"));
-		System.out.println("SALES_UNIT_PRICE: " + saleInfo.get("SALES_UNIT_PRICE"));
-		System.out.println("SALES_SUPPLY_PRICE: " + saleInfo.get("SALES_SUPPLY_PRICE"));
+	saleInfo = salesNcollectMgmtService.getSaleInfo(paramMap);
+	salesCurrency = CommonUtils.nullToEmpty((String)saleInfo.get("SALES_CURRENCY"));
+	
+	System.out.println("=== DB에서 조회한 saleInfo ===");
+	System.out.println("ORDER_QUANTITY: " + saleInfo.get("ORDER_QUANTITY"));
+	System.out.println("SALES_QUANTITY: " + saleInfo.get("SALES_QUANTITY"));
+	System.out.println("SALES_UNIT_PRICE: " + saleInfo.get("SALES_UNIT_PRICE"));
+	System.out.println("SALES_SUPPLY_PRICE: " + saleInfo.get("SALES_SUPPLY_PRICE"));
 		
 	// URL 파라미터로 그리드 데이터가 전달된 경우 우선 사용
 	if(paramMap.get("salesQuantity") != null && !paramMap.get("salesQuantity").equals("")) {
@@ -359,10 +360,13 @@ public class SalesNcollectMgmtController {
 		int totalSoldQuantity = 0;
 		try {
 			Map<String, Object> totalResult = salesNcollectMgmtService.getTotalSalesQuantity(paramMap);
+			System.out.println("getTotalSalesQuantity 결과: " + totalResult);
 			if(totalResult != null && totalResult.get("total") != null) {
+				System.out.println("total 값: " + totalResult.get("total"));
 				totalSoldQuantity = Integer.parseInt(String.valueOf(totalResult.get("total")).split("\\.")[0]);
 			}
 		} catch(Exception e) {
+			System.out.println("getTotalSalesQuantity 에러 발생!");
 			e.printStackTrace();
 		}
 		
diff --git a/src/com/pms/salesmgmt/mapper/salesNcollectMgmt.xml b/src/com/pms/salesmgmt/mapper/salesNcollectMgmt.xml
index 29d9831..88733f5 100644
--- a/src/com/pms/salesmgmt/mapper/salesNcollectMgmt.xml
+++ b/src/com/pms/salesmgmt/mapper/salesNcollectMgmt.xml
@@ -1490,6 +1490,11 @@ ORDER BY T.REGDATE DESC, T.PROJECT_NO DESC
 	-- 판매 관련 필드들 (sales_registration 테이블에서 가져오기)
 	SR.sale_no AS SALE_NO,
 	COALESCE(SR.shipping_order_status, '') AS SHIPPING_ORDER_STATUS,
+	
+	-- 주문수량 (PROJECT_MGMT에서 가져오기) - 잔량 계산용
+	COALESCE(T.QUANTITY::NUMERIC, 0) AS ORDER_QUANTITY,
+	
+	-- 판매수량 (sales_registration에서 가져오기) - 이미 판매한 수량
 	COALESCE(SR.sales_quantity, 0) AS SALES_QUANTITY,
 		COALESCE(SR.sales_unit_price, 0) AS SALES_UNIT_PRICE,
 		COALESCE(SR.sales_supply_price, 0) AS SALES_SUPPLY_PRICE,
@@ -1625,7 +1630,7 @@ ORDER BY T.REGDATE DESC, T.PROJECT_NO DESC
 	<!-- 모든 분할 출하의 총 판매 수량 조회 -->
 	<select id="getTotalSalesQuantity" parameterType="map" resultType="map">
 		/* salesNcollectMgmt.getTotalSalesQuantity - project_no로 시작하는 모든 레코드의 판매 수량 합계 */
-		SELECT COALESCE(SUM(sales_quantity), 0) as total
+		SELECT COALESCE(SUM(NULLIF(sales_quantity, '')::NUMERIC), 0) as total
 		FROM sales_registration
 		WHERE project_no LIKE #{orderNo} || '%'
 	</select>