Fix: child receipt account

CHANGELOG.md

@@ -7,7 +7,7 @@ This changelog is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.
 ## [Unreleased]
 
 ### Src
-- 
+- Fix child transaction receipts in `TransactionGetReceiptQuery` to properly expose protobuf fields like `accountID` by passing `None` instead of parent transaction_id (#1849)
 
 ### Tests
 

src/hiero_sdk_python/query/transaction_get_receipt_query.py

@@ -275,18 +275,21 @@ def _map_status_error(self, response: response_pb2.Response) -> Union[PrecheckEr
             TransactionReceipt._from_proto(response.transactionGetReceipt.receipt, self.transaction_id),
         )
 
-    def _map_receipt_list(self, receipts:  List[transaction_receipt_pb2.TransactionReceipt]) -> List["TransactionReceipt"]:
+    def _map_receipt_list(self, receipts:  List[transaction_receipt_pb2.TransactionReceipt], include_parent_tx_id: bool = False) -> List["TransactionReceipt"]:
         """
         Maps a list of protobuf transaction receipts to TransactionReceipt objects.
 
         Args:
             receipts: A list of protobuf TransactionReceipt objects
+            include_parent_tx_id: If True, pass parent transaction_id to mapped receipts (for duplicates).
+                                 If False, pass None (for child receipts).
 
         Returns:
             A list of TransactionReceipt objects
         """
+        transaction_id = self.transaction_id if include_parent_tx_id else None
         return [
-            TransactionReceipt._from_proto(receipt_proto, self.transaction_id)
+            TransactionReceipt._from_proto(receipt_proto, transaction_id)
             for receipt_proto in receipts
         ]
 
@@ -317,15 +320,19 @@ def execute(self, client: Client, timeout: Optional[Union[int, float]] = None) -
         parent = TransactionReceipt._from_proto(response.transactionGetReceipt.receipt, self.transaction_id)
 
         if self.include_children:
+            # Child receipts are sub-transactions; they don't need parent transaction_id
             children = self._map_receipt_list(
-                response.transactionGetReceipt.child_transaction_receipts
+                response.transactionGetReceipt.child_transaction_receipts, 
+                include_parent_tx_id=False
             )
 
             parent._set_children(children)
 
         if self.include_duplicates:
+            # Duplicate receipts are related to parent; keep parent transaction_id for context
             duplicates = self._map_receipt_list(
-                response.transactionGetReceipt.duplicateTransactionReceipts
+                response.transactionGetReceipt.duplicateTransactionReceipts,
+                include_parent_tx_id=True
             )
 
             parent._set_duplicates(duplicates)

src/hiero_sdk_python/transaction/transaction_receipt.py

@@ -89,13 +89,15 @@ def account_id(self) -> Optional[AccountId]:
         """
         Retrieves the AccountId associated with the transaction receipt, if available.
 
+        Unlike other ID properties (token_id, file_id, etc.), this returns the AccountId
+        even when accountNum is 0. This is intentional to support EVM auto-account creation
+        scenarios where the protobuf may contain an AccountID with num=0 to identify the
+        newly created account before it's fully initialized on-chain.
+
         Returns:
-            AccountId or None: The AccountId if present; otherwise, None.
+            AccountId or None: The AccountId if present (including num=0); otherwise, None.
         """
-        if (
-            self._receipt_proto.HasField("accountID")
-            and self._receipt_proto.accountID.accountNum != 0
-        ):
+        if self._receipt_proto.HasField("accountID"):
             return AccountId._from_proto(self._receipt_proto.accountID)
         return None
 
@@ -257,12 +259,12 @@ def _to_proto(self):
         return self._receipt_proto
 
     @classmethod
-    def _from_proto(cls, proto: transaction_receipt_pb2.TransactionReceipt, transaction_id: TransactionId) -> "TransactionReceipt":
+    def _from_proto(cls, proto: transaction_receipt_pb2.TransactionReceipt, transaction_id: TransactionId | None) -> "TransactionReceipt":
         """
         Creates a TransactionReceipt instance from a protobuf TransactionReceipt object.
         Args:
             proto (transaction_receipt_pb2.TransactionReceipt): The protobuf TransactionReceipt object.
-            transaction_id (TransactionId): The transaction ID associated with this receipt.
+            transaction_id (TransactionId | None): The transaction ID associated with this receipt. Can be None for child receipts.
         Returns:
             TransactionReceipt: A new instance of TransactionReceipt populated with data from the protobuf object.
         """