diff --git a/toonz/sources/toonz/subscenecommand.cpp b/toonz/sources/toonz/subscenecommand.cpp
index 0e6ae89..3a6c4cc 100644
--- a/toonz/sources/toonz/subscenecommand.cpp
+++ b/toonz/sources/toonz/subscenecommand.cpp
@@ -1123,9 +1123,16 @@ void bringPegbarsInsideChildXsheet(TXsheet *xsh, TXsheet *childXsh,
   for (pegbarIt = pegbarIds.begin(); pegbarIt != pegbarIds.end(); ++pegbarIt) {
     TStageObjectId id        = *pegbarIt;
     TStageObjectParams *data = xsh->getStageObject(id)->getParams();
-    childXsh->getStageObject(id)->assignParams(data);
+    TStageObject *obj        = childXsh->getStageObject(id);
+    obj->assignParams(data);
     delete data;
-    childXsh->getStageObject(id)->setParent(xsh->getStageObjectParent(id));
+    obj->setParent(xsh->getStageObjectParent(id));
+
+    // reset grammers of all parameters or they fails to refer to other
+    // parameters via expression
+    for (int c = 0; c != TStageObject::T_ChannelCount; ++c)
+      childXsh->getStageObjectTree()->setGrammar(
+          obj->getParam((TStageObject::Channel)c));
   }
 }
 
diff --git a/toonz/sources/toonzqt/stageobjectsdata.cpp b/toonz/sources/toonzqt/stageobjectsdata.cpp
index b66fbb0..fa5c551 100644
--- a/toonz/sources/toonzqt/stageobjectsdata.cpp
+++ b/toonz/sources/toonzqt/stageobjectsdata.cpp
@@ -8,6 +8,8 @@
 
 // TnzBase includes
 #include "tbasefx.h"
+#include "tparamcontainer.h"
+#include "tparamset.h"
 
 // TnzLib includes
 #include "toonz/tstageobject.h"
@@ -116,6 +118,20 @@ bool isColumnSelectionTerminalFx(TFx *fx, TFxSet *terminalFxs,
   return false;
 }
 
+//------------------------------------------------------
+
+template <typename ParamCont>
+void setGrammerToParams(const ParamCont *cont,
+                        const TSyntax::Grammar *grammer) {
+  for (int p = 0; p != cont->getParamCount(); ++p) {
+    TParam &param = *cont->getParam(p);
+    if (TDoubleParam *dp = dynamic_cast<TDoubleParam *>(&param))
+      dp->setGrammar(grammer);
+    else if (TParamSet *paramSet = dynamic_cast<TParamSet *>(&param))
+      setGrammerToParams(paramSet, grammer);
+  }
+}
+
 }  // namespace
 
 //********************************************************************************
@@ -1167,5 +1183,22 @@ std::vector<TStageObjectId> StageObjectsData::restoreObjects(
     }
   }
 
+  // reset grammers for all parameters of pasted stage objects and fxs
+  // or they fails to refer to other parameters via expression
+  // if they are pasted in different xsheet
+  TSyntax::Grammar *grammer = xsh->getStageObjectTree()->getGrammar();
+  for (auto id : restoredIds) {
+    TStageObject *obj = xsh->getStageObject(id);
+    for (int c = 0; c != TStageObject::T_ChannelCount; ++c)
+      obj->getParam((TStageObject::Channel)c)->setGrammar(grammer);
+    if (const PlasticSkeletonDeformationP &sd =
+            obj->getPlasticSkeletonDeformation())
+      sd->setGrammar(grammer);
+  }
+  std::map<TFx *, TFx *>::const_iterator it;
+  for (it = fxTable.begin(); it != fxTable.end(); ++it) {
+    setGrammerToParams(it->second->getParams(), grammer);
+  }
+
   return restoredIds;
 }