diff --git a/backend/src/main/java/org/eclipse/tractusx/puris/backend/stock/logic/service/PartnerProductStockService.java b/backend/src/main/java/org/eclipse/tractusx/puris/backend/stock/logic/service/PartnerProductStockService.java
index bf03b8fc..825fb2a0 100644
--- a/backend/src/main/java/org/eclipse/tractusx/puris/backend/stock/logic/service/PartnerProductStockService.java
+++ b/backend/src/main/java/org/eclipse/tractusx/puris/backend/stock/logic/service/PartnerProductStockService.java
@@ -38,6 +38,6 @@ public interface PartnerProductStockService {
 
     PartnerProductStock update(PartnerProductStock partnerProductStock);
 
-    List<PartnerProductStock> findAllByMaterialUuidAndPartnerUuid(UUID partnerUuid,
-                                                                  UUID materialUuid);
+    List<PartnerProductStock> findAllByMaterialUuidAndPartnerUuid(UUID materialUuid,
+                                                                  UUID partnerUuid);
 }
diff --git a/backend/src/main/java/org/eclipse/tractusx/puris/backend/stock/logic/service/PartnerProductStockServiceImpl.java b/backend/src/main/java/org/eclipse/tractusx/puris/backend/stock/logic/service/PartnerProductStockServiceImpl.java
index a0169db0..40a8b284 100644
--- a/backend/src/main/java/org/eclipse/tractusx/puris/backend/stock/logic/service/PartnerProductStockServiceImpl.java
+++ b/backend/src/main/java/org/eclipse/tractusx/puris/backend/stock/logic/service/PartnerProductStockServiceImpl.java
@@ -64,7 +64,7 @@ public PartnerProductStock update(PartnerProductStock partnerProductStock) {
     }
 
     @Override
-    public List<PartnerProductStock> findAllByMaterialUuidAndPartnerUuid(UUID partnerUuid, UUID materialUuid) {
+    public List<PartnerProductStock> findAllByMaterialUuidAndPartnerUuid(UUID materialUuid, UUID partnerUuid) {
         return partnerProductStockRepository.findAllByMaterial_UuidAndTypeAndSupplierPartner_Uuid(materialUuid, DT_StockTypeEnum.PRODUCT, partnerUuid);
     }
 }
diff --git a/backend/src/main/java/org/eclipse/tractusx/puris/backend/stock/logic/service/ProductStockResponseApiServiceImpl.java b/backend/src/main/java/org/eclipse/tractusx/puris/backend/stock/logic/service/ProductStockResponseApiServiceImpl.java
index 2b6e47f3..ec23ab3c 100644
--- a/backend/src/main/java/org/eclipse/tractusx/puris/backend/stock/logic/service/ProductStockResponseApiServiceImpl.java
+++ b/backend/src/main/java/org/eclipse/tractusx/puris/backend/stock/logic/service/ProductStockResponseApiServiceImpl.java
@@ -81,9 +81,9 @@ public void consumeResponse(ResponseDto responseDto) {
                 // or whether an update is sufficient.
                 List<PartnerProductStock> existingPartnerProductStocks =
                         partnerProductStockService.findAllByMaterialUuidAndPartnerUuid(
-                                partnerProductStockDto.getSupplierPartner().getUuid(),
-                                partnerProductStockDto.getMaterial().getUuid()
-                        );
+                                partnerProductStockDto.getMaterial().getUuid(),
+                                partnerProductStockDto.getSupplierPartner().getUuid()
+                            );
 
                 // currently we only accept a one to one mapping of partner - material - stock -site
                 // therefore the can only be one PartnerProductStock
@@ -104,8 +104,12 @@ public void consumeResponse(ResponseDto responseDto) {
                     log.info(String.format("Created Partner ProductStock from SAMM: %s",
                             createdPartnerProductStock));
                 } else {
+                    // update quantity only
+                    PartnerProductStock existingPartnerProductStock = existingPartnerProductStocks.get(0);
+                    existingPartnerProductStock.setQuantity(partnerProductStockDto.getQuantity());
+
                     PartnerProductStock updatedPartnerProductStock =
-                            partnerProductStockService.update(existingPartnerProductStocks.get(0));
+                            partnerProductStockService.update(existingPartnerProductStock);
                     log.info(String.format("Updated Partner ProductStock from SAMM: %s",
                             updatedPartnerProductStock));
                 }
diff --git a/frontend/src/views/StockView.vue b/frontend/src/views/StockView.vue
index 360c8c6e..a79cbe49 100644
--- a/frontend/src/views/StockView.vue
+++ b/frontend/src/views/StockView.vue
@@ -180,12 +180,12 @@ export default {
   methods: {
     addOrUpdateStock(changedStock) {
       if (changedStock.type === "Material") {
-        var existingMaterialStock = this.bdMaterialStocks.filter(
+        var existingMaterialStocks = this.bdMaterialStocks.filter(
             (stock) => (stock.material.uuid === changedStock.materialId)
         );
 
-        if (existingMaterialStock.length === 1) { // Update existing material stock
-          var existingMaterialStock = existingMaterialStock[0];
+        if (existingMaterialStocks.length === 1) { // Update existing material stock
+          var existingMaterialStock = existingMaterialStocks[0];
           existingMaterialStock.quantity = changedStock.quantity;
 
           this.putData(this.backendURL + this.endpointMaterialStocks, existingMaterialStock);