diff --git a/bitsharesbase/objects.py b/bitsharesbase/objects.py
index 50508da..e0d54b8 100644
--- a/bitsharesbase/objects.py
+++ b/bitsharesbase/objects.py
@@ -469,7 +469,10 @@ def __init__(self, *args, **kwargs):
                             ("fee_asset_id", ObjectId(kwargs["fee_asset_id"], "asset")),
                             ("spread_percent", Uint16(kwargs["spread_percent"])),
                             ("size_percent", Uint16(kwargs["size_percent"])),
-                            ("expiration_seconds", Uint32(kwargs["expiration_seconds"])),
+                            (
+                                "expiration_seconds",
+                                Uint32(kwargs["expiration_seconds"]),
+                            ),
                             ("repeat", Bool(kwargs["repeat"])),
                             ("extensions", Set([])),
                         ]
@@ -482,3 +485,15 @@ def __init__(self, *args, **kwargs):
         else:
             raise ValueError("Unknown {}".format(self.__class__.__name__))
         super().__init__(data, id)
+
+
+class LimitOrderCreateExtensions(Extension):
+    def NestedLimitOrderAutoAction(value):
+        if value:
+            return Array([LimitOrderAutoAction(o) for o in value])
+        else:
+            return None
+
+    sorted_options = [
+        ("on_fill", NestedLimitOrderAutoAction),
+    ]
diff --git a/bitsharesbase/operations.py b/bitsharesbase/operations.py
index fb45bc6..0c9e149 100644
--- a/bitsharesbase/operations.py
+++ b/bitsharesbase/operations.py
@@ -46,6 +46,7 @@
     isArgsThisClass,
     AssertPredicate,
     LimitOrderAutoAction,
+    LimitOrderCreateExtensions,
 )
 from .operationids import operations
 
@@ -387,7 +388,10 @@ def __init__(self, *args, **kwargs):
                         ("min_to_receive", Asset(kwargs["min_to_receive"])),
                         ("expiration", PointInTime(kwargs["expiration"])),
                         ("fill_or_kill", Bool(kwargs["fill_or_kill"])),
-                        ("extensions", Set([])),
+                        (
+                            "extensions",
+                            LimitOrderCreateExtensions(kwargs["extensions"]),
+                        ),
                     ]
                 )
             )
@@ -1226,6 +1230,7 @@ def __init__(self, *args, **kwargs):
                 )
             )
 
+
 class Liquidity_pool_update(GrapheneObject):
     def __init__(self, *args, **kwargs):
         if isArgsThisClass(self, args):
@@ -1240,7 +1245,9 @@ def __init__(self, *args, **kwargs):
                 taker_fee_percent = Optional(None)
 
             if kwargs.get("withdrawal_fee_percent"):
-                withdrawal_fee_percent = Optional(Uint16(kwargs["withdrawal_fee_percent"]))
+                withdrawal_fee_percent = Optional(
+                    Uint16(kwargs["withdrawal_fee_percent"])
+                )
             else:
                 withdrawal_fee_percent = Optional(None)
 
@@ -1257,6 +1264,7 @@ def __init__(self, *args, **kwargs):
                 )
             )
 
+
 class Credit_deal_update(GrapheneObject):
     def __init__(self, *args, **kwargs):
         if isArgsThisClass(self, args):
@@ -1275,7 +1283,8 @@ def __init__(self, *args, **kwargs):
                     ]
                 )
             )
-            
+
+
 class Limit_order_update(GrapheneObject):
     def __init__(self, *args, **kwargs):
         if isArgsThisClass(self, args):
@@ -1300,7 +1309,9 @@ def __init__(self, *args, **kwargs):
                 new_expiration = Optional(None)
 
             if kwargs.get("on_fill"):
-                on_fill = Optional(Array([LimitOrderAutoAction(o) for o in kwargs["on_fill"]]))
+                on_fill = Optional(
+                    Array([LimitOrderAutoAction(o) for o in kwargs["on_fill"]])
+                )
             else:
                 on_fill = Optional(None)
 
@@ -1319,4 +1330,5 @@ def __init__(self, *args, **kwargs):
                 )
             )
 
+
 fill_classmaps()
diff --git a/tests/test_transactions.py b/tests/test_transactions.py
index bdaf72b..830ce5c 100644
--- a/tests/test_transactions.py
+++ b/tests/test_transactions.py
@@ -83,15 +83,29 @@ def test_limit_order_create(self):
                 "min_to_receive": {"amount": 10000, "asset_id": "1.3.105"},
                 "expiration": "2016-05-18T09:22:05",
                 "fill_or_kill": False,
-                "extensions": [],
+                "extensions": {
+                    "on_fill": [
+                        [
+                            0,
+                            {
+                                "fee_asset_id": "1.3.0",
+                                "spread_percent": 100,
+                                "size_percent": 1000,
+                                "expiration_seconds": 3600,
+                                "repeat": True,
+                                "extensions": [],
+                            },
+                        ]
+                    ]
+                },
             }
         )
         self.cm = (
-            "f68585abf4dce7c8045701016400000000000000001da08601000"
-            "0000000001027000000000000693d343c57000000011f75cbfd49"
-            "ae8d9b04af76cc0a7de8b6e30b71167db7fe8e2197ef9d858df18"
-            "77043493bc24ffdaaffe592357831c978fd8a296b913979f106de"
-            "be940d60d77b50"
+            "f68585abf4dce7c8045701016400000000000000001da0860100000"
+            "00000001027000000000000693d343c570001000100006400e80310"
+            "0e0000010000011f5ddffd232fd713e106aec3068646f5a74ae145e"
+            "08e1e13f7464885a507e808e365594f5e7c14049d9432bcf1ca2330"
+            "a65d1b7ab88aa08b355970ca6f23e06aa0"
         )
         self.doit()
 
@@ -1045,6 +1059,97 @@ def test_assert_b(self):
         )
         self.doit(0)
 
+    def test_limit_order_update(self):
+        self.op = operations.Limit_order_update(
+            **{
+                "fee": {"amount": 0, "asset_id": "1.3.0"},
+                "seller": "1.2.4",
+                "order": "1.7.12535",
+                "extensions": [],
+            }
+        )
+        self.cm = (
+            "f68585abf4dce7c80457014d00000000000000000004f76100"
+            "0000000000011f06d0b4467a5916ffb3d8ef4261c0719b1fb0"
+            "964aa5d3fbecbfbcbc9fe1117bc20e8a2c3f87e7817b83446c"
+            "45deb2a0d3d5b8b0d3b22fc8076ffc8eeb1a95e928"
+        )
+        self.doit(0)
+
+        self.op = operations.Limit_order_update(
+            **{
+                "fee": {"amount": 0, "asset_id": "1.3.0"},
+                "seller": "1.2.4",
+                "order": "1.7.12535",
+                "new_price": {
+                    "base": {"amount": 1123456, "asset_id": "1.3.0"},
+                    "quote": {"amount": 78901122, "asset_id": "1.3.0"},
+                },
+                "delta_amount_to_sell": {"amount": 12562, "asset_id": "1.3.0"},
+                "new_expiration": "2023-12-18T09:22:05",
+                "on_fill": [
+                    [
+                        0,
+                        {
+                            "fee_asset_id": "1.3.0",
+                            "spread_percent": 100,
+                            "size_percent": 1000,
+                            "expiration_seconds": 3600,
+                            "repeat": True,
+                            "extensions": [],
+                        },
+                    ]
+                ],
+                "extensions": [],
+            }
+        )
+        self.cm = (
+            "f68585abf4dce7c80457014d00000000000000000004f76101"
+            "80241100000000000082efb304000000000001123100000000"
+            "000000013d0f8065010100006400e803100e00000100000001"
+            "2051a24fb550e4a8ec890ad404ea0e3cf6ea449d6ba397d280"
+            "64f7129153dd013e27846eb6567a88d8eea7557f32ddc02cdc"
+            "a614c5a30130c83141c4050ffc50e2"
+        )
+        self.doit()
+
+    def test_liquidity_pool_update(self):
+        self.op = operations.Liquidity_pool_update(
+            **{
+                "fee": {"amount": 0, "asset_id": "1.3.0"},
+                "account": "1.2.4",
+                "pool": "1.19.13356",
+                "taker_fee_percent": 124,
+                "withdrawal_fee_percent": 125,
+                "extensions": [],
+            }
+        )
+        self.cm = (
+            "f68585abf4dce7c80457014b00000000000000000004ac6801"
+            "7c00017d00000001202e3f140515ce936020348f845a4c034b"
+            "164441049dfe0a59a6c0fe27cbef740c10fa0d315e14e77e62"
+            "d8dae4f45d95fef358ff79f5304a420d6fc13abfd9374b"
+        )
+        self.doit(0)
+
+    def test_credit_deal_update(self):
+        self.op = operations.Credit_deal_update(
+            **{
+                "fee": {"amount": 0, "asset_id": "1.3.0"},
+                "account": "1.2.4",
+                "deal_id": "1.22.2356",
+                "auto_repay": 24,
+                "extensions": [],
+            }
+        )
+        self.cm = (
+            "f68585abf4dce7c80457014c00000000000000000004b41218"
+            "0000012026b59b7796cb9ca40d92b1d339558a94aa9f70d2f6"
+            "d8a7b8b0155c943b89bd602a1ecc9df3143664f801f401a728"
+            "78cce9f064dbcfc1af65826ce68a2177a38d"
+        )
+        self.doit()
+
     def compareConstructedTX(self):
         self.maxDiff = None
         self.op = operations.Call_order_update(