diff --git a/src/Att.cpp b/src/Att.cpp
index 9eaa4a497..75f3897fe 100644
--- a/src/Att.cpp
+++ b/src/Att.cpp
@@ -42,6 +42,8 @@ static const char* internalNames[] =
   "entry",
   "start",
   "end",
+  "parent",
+  "uuid",
   "mask",
   "imask",
   "limit",
@@ -378,8 +380,16 @@ bool Att::validNameValue (
             "\" is not a valid status.  Use 'pending', 'completed', 'deleted' or 'recurring'.";
   }
 
+  else if (name == "parent")
+  {
+  }
+
+  else if (name == "uuid")
+  {
+  }
+
   else
-    throw std::string ("'") + name + "' is an unrecognized attribute.";
+    throw std::string ("'") + name + "' is not a recognized attribute.";
 
   return true;
 }
diff --git a/src/Context.cpp b/src/Context.cpp
index 995044247..02ef8b8da 100644
--- a/src/Context.cpp
+++ b/src/Context.cpp
@@ -339,6 +339,18 @@ void Context::loadCorrectConfigFile ()
 
 ////////////////////////////////////////////////////////////////////////////////
 void Context::parse ()
+{
+  parse (args, cmd, task, sequence, subst, filter);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+void Context::parse (
+  std::vector <std::string>& parseArgs,
+  Cmd& parseCmd,
+  Task& parseTask,
+  Sequence& parseSequence,
+  Subst& parseSubst,
+  Filter& parseFilter)
 {
   Att attribute;
   tagAdditions.clear ();
@@ -348,7 +360,7 @@ void Context::parse ()
   bool foundSequence               = false;
   bool foundSomethingAfterSequence = false;
 
-  foreach (arg, args)
+  foreach (arg, parseArgs)
   {
     if (!terminated)
     {
@@ -361,12 +373,12 @@ void Context::parse ()
 
       // Sequence
       // Note: "add" doesn't require an ID
-      else if (cmd.command != "add"          &&
+      else if (parseCmd.command != "add"          &&
                ! foundSomethingAfterSequence &&
-               sequence.valid (*arg))
+               parseSequence.valid (*arg))
       {
         header ("parse sequence '" + *arg + "'");
-        sequence.parse (*arg);
+        parseSequence.parse (*arg);
         foundSequence = true;
       }
 
@@ -379,8 +391,12 @@ void Context::parse ()
         if (foundSequence)
           foundSomethingAfterSequence = true;
 
+        if (arg->find (',') != std::string::npos)
+          throw stringtable.get (TAGS_NO_COMMA,
+                                 "Tags are not permitted to contain commas.");
+
         tagAdditions.push_back (arg->substr (1, std::string::npos));
-        task.addTag            (arg->substr (1, std::string::npos));
+        parseTask.addTag       (arg->substr (1, std::string::npos));
       }
 
       // Tags to remove begin with '-'.
@@ -417,25 +433,25 @@ void Context::parse ()
         attribute.mod (mod);
         attribute.value (value);
 
-        task[attribute.name ()] = attribute;
+        parseTask[attribute.name ()] = attribute;
       }
 
       // Substitution of description and/or annotation text.
-      else if (subst.valid (*arg))
+      else if (parseSubst.valid (*arg))
       {
         if (foundSequence)
           foundSomethingAfterSequence = true;
 
         header ("parse subst '" + *arg + "'");
-        subst.parse (*arg);
+        parseSubst.parse (*arg);
       }
 
       // It might be a command if one has not already been found.
-      else if (cmd.command == "" &&
-               cmd.valid (*arg))
+      else if (parseCmd.command == "" &&
+               parseCmd.valid (*arg))
       {
         header ("parse cmd '" + *arg + "'");
-        cmd.parse (*arg);
+        parseCmd.parse (*arg);
 
         if (foundSequence)
           foundSomethingAfterSequence = true;
@@ -469,26 +485,26 @@ void Context::parse ()
   if (descCandidate != "" && noVerticalSpace (descCandidate))
   {
     header ("parse description '" + descCandidate + "'");
-    task.set ("description", descCandidate);
+    parseTask.set ("description", descCandidate);
   }
 
   // TODO task.validate () ?
 
   // Read-only command (reports, status, info ...) use filters.  Write commands
   // (add, done ...) do not.
-  if (cmd.isReadOnlyCommand ())
-    autoFilter ();
+  if (parseCmd.isReadOnlyCommand ())
+    autoFilter (parseTask, parseFilter);
 
   // If no command was specified, and there were no command line arguments
   // then invoke the default command.
-  if (cmd.command == "" && args.size () == 0)
+  if (parseCmd.command == "" && parseArgs.size () == 0)
   {
     std::string defaultCommand = config.get ("default.command");
     if (defaultCommand != "")
     {
       // Stuff the command line.
-      args.clear ();
-      split (args, defaultCommand, ' ');
+      parseArgs.clear ();
+      split (parseArgs, defaultCommand, ' ');
       header ("[task " + defaultCommand + "]");
 
       // Reinitialize the context and recurse.
@@ -500,9 +516,9 @@ void Context::parse ()
 
 ////////////////////////////////////////////////////////////////////////////////
 // Add all the attributes in the task to the filter.  All except uuid.
-void Context::autoFilter ()
+void Context::autoFilter (Task& t, Filter& f)
 {
-  foreach (att, task)
+  foreach (att, t)
   {
     // Words are found in the description using the .has modifier.
     if (att->first == "description")
@@ -511,7 +527,7 @@ void Context::autoFilter ()
       split (words, att->second.value (), ' ');
       foreach (word, words)
       {
-        filter.push_back (Att ("description", "has", *word));
+        f.push_back (Att ("description", "has", *word));
         header ("auto filter: " + att->first + ".has:" + *word);
       }
     }
@@ -519,7 +535,7 @@ void Context::autoFilter ()
     // Projects are matched left-most.
     else if (att->first == "project")
     {
-      filter.push_back (Att ("project", "startswith", att->second.value ()));
+      f.push_back (Att ("project", "startswith", att->second.value ()));
         header ("auto filter: " + att->first + ".startswith:" + att->second.value ());
     }
 
@@ -529,7 +545,7 @@ void Context::autoFilter ()
     else if (att->first != "uuid" &&
              att->first != "tags")
     {
-      filter.push_back (att->second);
+      f.push_back (att->second);
       header ("auto filter: " + att->first + ":" + att->second.value ());
     }
   }
@@ -537,14 +553,14 @@ void Context::autoFilter ()
   // Include tagAdditions.
   foreach (tag, tagAdditions)
   {
-    filter.push_back (Att ("tags", "has", *tag));
+    f.push_back (Att ("tags", "has", *tag));
     header ("auto filter: +" + *tag);
   }
 
   // Include tagRemovals.
   foreach (tag, tagRemovals)
   {
-    filter.push_back (Att ("tags", "hasnt", *tag));
+    f.push_back (Att ("tags", "hasnt", *tag));
     header ("auto filter: -" + *tag);
   }
 }
diff --git a/src/Context.h b/src/Context.h
index 6fd47cc60..5b891702e 100644
--- a/src/Context.h
+++ b/src/Context.h
@@ -58,10 +58,11 @@ public:
   void clearMessages ();
 
   void parse ();
+  void parse (std::vector <std::string>&, Cmd&, Task&, Sequence&, Subst&, Filter&);
 
 private:
   void loadCorrectConfigFile ();
-  void autoFilter ();
+  void autoFilter (Task&, Filter&);
 
 public:
   Config                    config;
diff --git a/src/custom.cpp b/src/custom.cpp
index 48610052b..32bc5c512 100644
--- a/src/custom.cpp
+++ b/src/custom.cpp
@@ -72,7 +72,7 @@ std::string handleCustomReport (const std::string& report)
     for (unsigned int i = 0; i < columns.size (); ++i)
       columnLabels[columns[i]] = labels[i];
 
-  std::string sortList   = context.config.get ("report." + report + ".sort");
+  std::string sortList = context.config.get ("report." + report + ".sort");
   std::vector <std::string> sortOrder;
   split (sortOrder, sortList, ',');
   validSortColumns (columns, sortOrder);
@@ -80,11 +80,23 @@ std::string handleCustomReport (const std::string& report)
   std::string filterList = context.config.get ("report." + report + ".filter");
   std::vector <std::string> filterArgs;
   split (filterArgs, filterList, ' ');
+  {
+    Cmd cmd (report);
+    Task task;
+    Sequence sequence;
+    Subst subst;
+    Filter filter;
+    context.parse (filterArgs, cmd, task, sequence, subst, filter);
+
+    context.sequence.combine (sequence);
+
+    foreach (att, filter)
+      context.filter.push_back (*att);
+  }
 
   // Get all the tasks.
   std::vector <Task> tasks;
   context.tdb.lock (context.config.get ("locking", true));
-  // TODO Include filter from custom report.
   context.tdb.load (tasks, context.filter);
   handleRecurrence (tasks);
   context.tdb.commit ();