diff --git a/models/helpers.ts b/models/helpers.ts
index e4f8566a..e8c490d3 100644
--- a/models/helpers.ts
+++ b/models/helpers.ts
@@ -1087,10 +1087,22 @@ export async function getPricingRule(
       continue;
     }
 
+    const itemQuantity: Record<string, number> = {};
+
+    for (const item of doc.items) {
+      if (!item?.item) continue;
+
+      if (!itemQuantity[item.item]) {
+        itemQuantity[item.item] = item.quantity ?? 0;
+      } else {
+        itemQuantity[item.item] += item.quantity ?? 0;
+      }
+    }
+
     const filtered = filterPricingRules(
       doc as SalesInvoice,
       pricingRuleDocsForItem,
-      item.quantity as number,
+      itemQuantity[item.item as string],
       item.amount as Money
     );
 
diff --git a/src/pages/POS/POS.vue b/src/pages/POS/POS.vue
index 472eecfd..a49748f7 100644
--- a/src/pages/POS/POS.vue
+++ b/src/pages/POS/POS.vue
@@ -690,12 +690,39 @@ export default defineComponent({
         )) as number;
 
         if (item.hasBatch) {
+          const addQty = quantity ?? 1;
+
+          if (existingItems.length > 0) {
+            for (let item of existingItems) {
+              const availableQty = await fyo.db.getStockQuantity(
+                item.item as string,
+                undefined,
+                undefined,
+                undefined,
+                item.batch
+              );
+              if (
+                item.batch != null &&
+                availableQty != null &&
+                availableQty > (item.quantity as number)
+              ) {
+                const currentQty = item.quantity ?? 0;
+                await item.set('quantity', currentQty + addQty);
+                await this.applyPricingRule();
+                await this.sinvDoc.runFormulas();
+                return;
+              }
+            }
+          }
+
           await this.sinvDoc.append('items', {
             rate: item.rate as Money,
             item: item.name,
-            quantity: quantity ? quantity : 1,
+            quantity: addQty,
             hsnCode: itemsHsncode,
           });
+          await this.applyPricingRule();
+          await this.sinvDoc.runFormulas();
           return;
         }