diff --git a/absbox/local/component.py b/absbox/local/component.py
index 6ebfb27..a55784d 100644
--- a/absbox/local/component.py
+++ b/absbox/local/component.py
@@ -178,7 +178,9 @@ def mkDs(x):
             return mkTag("CurrentBondBalance")
         case ("债券余额", *bnds) | ("bondBalance", *bnds):
             return mkTag(("CurrentBondBalanceOf", vList(bnds, str)))
-        case ("初始债券余额",) | ("originalBondBalance",):
+        case ("初始债券余额",*bnds) | ("originalBondBalance",*bnds):
+            if bnds:
+                return mkTag("OriginalBondBalanceOf", vList(bnds, str))
             return mkTag("OriginalBondBalance")
         case ("到期月份", bn) | ("monthsTillMaturity", bn):
             return mkTag(("MonthsTillMaturity", vStr(bn)))
@@ -247,7 +249,7 @@ def mkDs(x):
         case ("资产池系数", *pNames) | ("poolFactor", *pNames):
             if pNames:
                 return mkTag(("PoolFactor", lmap(mkPid,pNames)))
-            return mkTag("PoolFactor")
+            return mkTag(("PoolFactor", None))
         case ("债券利率", bn) | ("bondRate", bn):
             return mkTag(("BondRate", vStr(bn)))
         case ("债券加权利率", *bn) | ("bondWaRate", *bn):
@@ -306,6 +308,8 @@ def mkDs(x):
             return mkTag(("AccTxnAmt", [ans, cmt]))
         case ("系数", ds, f) | ("factor", ds, f) | ("*", ds, f) if isinstance(f, float):
             return mkTag(("Factor", [mkDs(ds), f]))
+        case ("*", *ds):
+            return mkTag(("Multiply", lmap(mkDs, ds)))
         case ("Min", *ds) | ("min", *ds):
             return mkTag(("Min", lmap(mkDs, ds)))
         case ("Max", *ds) | ("max", *ds):
diff --git a/docs/source/howto.rst b/docs/source/howto.rst
index d3c450b..c43ec61 100644
--- a/docs/source/howto.rst
+++ b/docs/source/howto.rst
@@ -1078,3 +1078,11 @@ A string
 ^^^^^^^^^^^^^^^
 
 Now with that string, user can just write it into a No-SQL document database . or sent via Email , or Fax it .
+
+
+How to use Deal JSON string 
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+The JSON string from `.json()` method can be used as part of post request send to `Hastructure` engine.
+
+But unfortunately there is no way convert the string back to python class so far.
\ No newline at end of file
diff --git a/docs/source/modeling.rst b/docs/source/modeling.rst
index ac0e00d..eca987a 100644
--- a/docs/source/modeling.rst
+++ b/docs/source/modeling.rst
@@ -211,6 +211,7 @@ Bond
     * ``("bondBalance",)`` -> sum of all bond balance
     * ``("bondBalance","A","B"...)`` -> sum of balance of bond A and bond B
     * ``("originalBondBalance",)`` -> bond balance at issuance
+    * ``("originalBondBalance","A","B")`` -> bond balance at issuance of "A" and "B" 
     * ``("bondFactor",)``  -> bond factor
     * ``("bondDueInt","A","B")``  -> bond due interest for bond A and bond B
     * ``("lastBondIntPaid","A")``  -> bond last paid interest
@@ -226,10 +227,10 @@ Pool
     * ``("cumPoolDefaultedBalance",)``  -> pool cumulative defaulted balance 
     * ``("cumPoolNetLoss",)`` -> pool cumulative pool net loss balance
     * ``("cumPoolRecoveries",)`` -> pool cumulative recoveries
-    * ``("cumPoolCollection", <field1>,<field2>....)`` -> pool cumulative on <field...> fields :ref:`Pool Sources`
-    * ``("cumPoolCollectionTill", N,<field1>,<field2>....)`` -> pool cumulative on <field...> fields till Period N :ref:`Pool Sources`
-    * ``("curPoolCollection", <field1>,<field2>...)``   -> pool current sum of fields
-    * ``("curPoolCollectionTill", N,<field1>,<field2>...)``   -> pool current sum of fields till Period N
+    * ``("cumPoolCollection", None, <field1>,<field2>....)`` -> pool cumulative on <field...> fields :ref:`Pool Sources`
+    * ``("cumPoolCollectionTill", None, N,<field1>,<field2>....)`` -> pool cumulative on <field...> fields till Period N :ref:`Pool Sources`
+    * ``("curPoolCollection", None, <field1>,<field2>...)``   -> pool current sum of fields
+    * ``("curPoolCollectionTill", None, N,<field1>,<field2>...)``   -> pool current sum of fields till Period N
   
 .. versionadded:: 0.24.1