diff --git a/app/api/services/select_offer.py b/app/api/services/select_offer.py
index 15e5c10..e2908e3 100644
--- a/app/api/services/select_offer.py
+++ b/app/api/services/select_offer.py
@@ -3,6 +3,7 @@ from marshmallow import ValidationError
 from app.api.helpers.response_helper import ResponseHelper
 from app.api.services.base_service import BaseService
 from app.api.enums import TransactionType
+from app.models.transaction_offers import TransactionOffer
 from app.utils.logger import logger
 from app.api.schemas.select_offer import SelectOfferSchema
 from app.extensions import db
@@ -57,14 +58,20 @@ class SelectOfferService(BaseService):
                 # Get the offer by product ID
                 offer = Offer.get_offer_by_product_id(product_id)
 
+                transaction_offer = TransactionOffer.get_transaction_offer(transaction_offer_id=offer_id)
+
+                if not transaction_offer:
+                    logger.error(f"offer {offer_id} not found for customer {customer_id} and transaction {transaction_id}.")
+                    return ResponseHelper.error(result_description="Offer not found.")
+
                 db.session.flush()
 
-                if amount < offer.min_amount:
-                    logger.error(f"The amount {amount} is less than the minimum allowed offer amount {offer.min_amount}.")
+                if amount < transaction_offer.min_amount:
+                    logger.error(f"The amount {amount} is less than the minimum allowed offer amount {transaction_offer.min_amount}.")
                     return ResponseHelper.error(result_description="The amount is less than the minimum allowed offer amount.")
-                elif amount > offer.max_amount:
-                    logger.error(f"The amount {amount} is greater than the minimum allowed offer amount {offer.min_amount}.")
-                    return ResponseHelper.error(result_description="The amount is greater than the maximum allowed offer amount.")
+                elif amount > transaction_offer.eligible_amount:
+                    logger.error(f"The amount {amount} is greater than the eligible offer amount {transaction_offer.eligible_amount}.")
+                    return ResponseHelper.error(result_description="The amount is greater than the eligible offer amount.")
 
                     
 
diff --git a/app/models/transaction_offers.py b/app/models/transaction_offers.py
index a14943f..b0e7508 100644
--- a/app/models/transaction_offers.py
+++ b/app/models/transaction_offers.py
@@ -85,6 +85,13 @@ class TransactionOffer(db.Model):
         return cls.query.filter_by(customer_id=customer_id) \
             .order_by(cls.created_at.desc()) \
             .first()
+    
+    @classmethod
+    def get_transaction_offer(cls, transaction_offer_id):
+        """
+        Returns a transaction offer by its ID.
+        """
+        return cls.query.get(transaction_offer_id)