diff --git a/xi/sdk/resellers/models/price_and_availability_request.py b/xi/sdk/resellers/models/price_and_availability_request.py
index 3d9d450..ed0312d 100644
--- a/xi/sdk/resellers/models/price_and_availability_request.py
+++ b/xi/sdk/resellers/models/price_and_availability_request.py
@@ -34,7 +34,7 @@ class PriceAndAvailabilityRequest(BaseModel):
     special_bid_number: Optional[StrictStr] = Field(default=None, description="Pre-approved special pricing/bid number provided to the reseller by the vendor for special pricing and discounts. Used to track the bid number where different line items have different bid numbers.", alias="specialBidNumber")
     availability_by_warehouse: Optional[List[PriceAndAvailabilityRequestAvailabilityByWarehouseInner]] = Field(default=None, alias="availabilityByWarehouse")
     products: Optional[List[PriceAndAvailabilityRequestProductsInner]] = None
-    additional_attributes: Optional[List[PriceAndAvailabilityRequestAdditionalAttributesInner]] = Field(default=None, alias="additionalAttributes")
+    additional_attributes: Optional[List[Optional[PriceAndAvailabilityRequestAdditionalAttributesInner]]] = Field(default=None, alias="additionalAttributes")
     __properties: ClassVar[List[str]] = ["showAvailableDiscounts", "showReserveInventoryDetails", "specialBidNumber", "availabilityByWarehouse", "products", "additionalAttributes"]
 
     model_config = ConfigDict(
@@ -97,6 +97,21 @@ def to_dict(self) -> Dict[str, Any]:
                 if _item_additional_attributes:
                     _items.append(_item_additional_attributes.to_dict())
             _dict['additionalAttributes'] = _items
+        # set to None if special_bid_number (nullable) is None
+        # and model_fields_set contains the field
+        if self.special_bid_number is None and "special_bid_number" in self.model_fields_set:
+            _dict['specialBidNumber'] = None
+
+        # set to None if availability_by_warehouse (nullable) is None
+        # and model_fields_set contains the field
+        if self.availability_by_warehouse is None and "availability_by_warehouse" in self.model_fields_set:
+            _dict['availabilityByWarehouse'] = None
+
+        # set to None if additional_attributes (nullable) is None
+        # and model_fields_set contains the field
+        if self.additional_attributes is None and "additional_attributes" in self.model_fields_set:
+            _dict['additionalAttributes'] = None
+
         return _dict
 
     @classmethod
diff --git a/xi/sdk/resellers/models/price_and_availability_request_additional_attributes_inner.py b/xi/sdk/resellers/models/price_and_availability_request_additional_attributes_inner.py
index ed55fae..8b63466 100644
--- a/xi/sdk/resellers/models/price_and_availability_request_additional_attributes_inner.py
+++ b/xi/sdk/resellers/models/price_and_availability_request_additional_attributes_inner.py
@@ -69,6 +69,16 @@ def to_dict(self) -> Dict[str, Any]:
             exclude=excluded_fields,
             exclude_none=True,
         )
+        # set to None if attribute_name (nullable) is None
+        # and model_fields_set contains the field
+        if self.attribute_name is None and "attribute_name" in self.model_fields_set:
+            _dict['attributeName'] = None
+
+        # set to None if attribute_value (nullable) is None
+        # and model_fields_set contains the field
+        if self.attribute_value is None and "attribute_value" in self.model_fields_set:
+            _dict['attributeValue'] = None
+
         return _dict
 
     @classmethod
diff --git a/xi/sdk/resellers/models/price_and_availability_request_availability_by_warehouse_inner.py b/xi/sdk/resellers/models/price_and_availability_request_availability_by_warehouse_inner.py
index 3651aed..dd01b96 100644
--- a/xi/sdk/resellers/models/price_and_availability_request_availability_by_warehouse_inner.py
+++ b/xi/sdk/resellers/models/price_and_availability_request_availability_by_warehouse_inner.py
@@ -69,6 +69,16 @@ def to_dict(self) -> Dict[str, Any]:
             exclude=excluded_fields,
             exclude_none=True,
         )
+        # set to None if availability_by_warehouse_id (nullable) is None
+        # and model_fields_set contains the field
+        if self.availability_by_warehouse_id is None and "availability_by_warehouse_id" in self.model_fields_set:
+            _dict['availabilityByWarehouseId'] = None
+
+        # set to None if availability_for_all_location (nullable) is None
+        # and model_fields_set contains the field
+        if self.availability_for_all_location is None and "availability_for_all_location" in self.model_fields_set:
+            _dict['availabilityForAllLocation'] = None
+
         return _dict
 
     @classmethod
diff --git a/xi/sdk/resellers/models/price_and_availability_request_products_inner.py b/xi/sdk/resellers/models/price_and_availability_request_products_inner.py
index e30b1ea..e2b4296 100644
--- a/xi/sdk/resellers/models/price_and_availability_request_products_inner.py
+++ b/xi/sdk/resellers/models/price_and_availability_request_products_inner.py
@@ -33,7 +33,7 @@ class PriceAndAvailabilityRequestProductsInner(BaseModel):
     upc: Optional[StrictStr] = Field(default=None, description="The UPC code for the product. Consists of 12 numeric digits that are uniquely assigned to each trade item.")
     quantity_requested: Optional[StrictStr] = Field(default=None, description="Number of quantity of the Product.", alias="quantityRequested")
     plan_id: Optional[StrictStr] = Field(default=None, description="Id of the plan", alias="planID")
-    additional_attributes: Optional[List[PriceAndAvailabilityRequestProductsInnerAdditionalAttributesInner]] = Field(default=None, alias="additionalAttributes")
+    additional_attributes: Optional[List[Optional[PriceAndAvailabilityRequestProductsInnerAdditionalAttributesInner]]] = Field(default=None, alias="additionalAttributes")
     __properties: ClassVar[List[str]] = ["ingramPartNumber", "vendorPartNumber", "customerPartNumber", "upc", "quantityRequested", "planID", "additionalAttributes"]
 
     model_config = ConfigDict(
@@ -112,6 +112,11 @@ def to_dict(self) -> Dict[str, Any]:
         if self.plan_id is None and "plan_id" in self.model_fields_set:
             _dict['planID'] = None
 
+        # set to None if additional_attributes (nullable) is None
+        # and model_fields_set contains the field
+        if self.additional_attributes is None and "additional_attributes" in self.model_fields_set:
+            _dict['additionalAttributes'] = None
+
         return _dict
 
     @classmethod
diff --git a/xi/sdk/resellers/models/price_and_availability_request_products_inner_additional_attributes_inner.py b/xi/sdk/resellers/models/price_and_availability_request_products_inner_additional_attributes_inner.py
index acc31f8..f205cd5 100644
--- a/xi/sdk/resellers/models/price_and_availability_request_products_inner_additional_attributes_inner.py
+++ b/xi/sdk/resellers/models/price_and_availability_request_products_inner_additional_attributes_inner.py
@@ -69,6 +69,16 @@ def to_dict(self) -> Dict[str, Any]:
             exclude=excluded_fields,
             exclude_none=True,
         )
+        # set to None if attribute_name (nullable) is None
+        # and model_fields_set contains the field
+        if self.attribute_name is None and "attribute_name" in self.model_fields_set:
+            _dict['attributeName'] = None
+
+        # set to None if attribute_value (nullable) is None
+        # and model_fields_set contains the field
+        if self.attribute_value is None and "attribute_value" in self.model_fields_set:
+            _dict['attributeValue'] = None
+
         return _dict
 
     @classmethod