diff --git a/actsim.cc b/actsim.cc
index 8e9e9a6..bd11d60 100644
--- a/actsim.cc
+++ b/actsim.cc
@@ -94,6 +94,8 @@ ActSimCore::ActSimCore (Process *p)
   I.H = NULL;
   I.obj = NULL;
 
+  _is_internal_parallel = 0;
+
   if (!root_scope->isExpanded()) {
     fatal_error ("Need to expand ACT prior to starting a simulation");
   }
@@ -343,6 +345,12 @@ ChpSim *ActSimCore::_add_chp (act_chp *c)
     if (!pgi->chp) {
       ChpSimGraph *stop;
       NEW (pgi->chp, chpsimgraph_info);
+      if (c->c && c->c->type == ACT_CHP_COMMA) {
+	setInternalParallel (1);
+      }
+      else {
+	setInternalParallel (0);
+      }
       pgi->chp->g = ChpSimGraph::buildChpSimGraph (this, c->c,  &stop);
       pgi->chp->e = NULL;
       pgi->chp->max_count = ChpSimGraph::max_pending_count;
@@ -407,6 +415,13 @@ ChpSim *ActSimCore::_add_hse (act_chp *c)
   if (!pgi->hse) {
     ChpSimGraph *stop;
     NEW (pgi->hse, chpsimgraph_info);
+
+    if (c->c && c->c->type == ACT_CHP_COMMA) {
+      setInternalParallel (1);
+    }
+    else {
+      setInternalParallel (0);
+    }
     pgi->hse->g = ChpSimGraph::buildChpSimGraph (this, c->c,  &stop);
     pgi->hse->max_count = ChpSimGraph::max_pending_count;
     pgi->hse->max_stats = ChpSimGraph::max_stats;
diff --git a/actsim.h b/actsim.h
index 2d300af..e052106 100644
--- a/actsim.h
+++ b/actsim.h
@@ -501,6 +501,11 @@ class ActSimCore {
     return f;
   }
 
+
+  int isInternalParallel() { return _is_internal_parallel; }
+  void setInternalParallel (int v) { _is_internal_parallel = v; }
+  
+
 protected:
   Act *a;
 
@@ -550,6 +555,10 @@ class ActSimCore {
   stateinfo_t *_rootsi;		/* root stateinfo; needed for globals
 				   */
 
+  int _is_internal_parallel;    /* used to let the graph construction
+				   phase know that there is internal
+				   parallelism */
+
   struct iHashtable *_W;		/* watchpoints */
   struct iHashtable *_B;		/* breakpoints */
 
diff --git a/chpsim.cc b/chpsim.cc
index 34b82ac..f694571 100644
--- a/chpsim.cc
+++ b/chpsim.cc
@@ -4215,7 +4215,7 @@ static chpsimstmt *gc_to_chpsim (act_chp_gc_t *gc, ActSimCore *s)
   if (flags & 0x1) {
     ret->u.cond.is_probe = 1;
   }
-  if (flags & 0x2) {
+  if ((flags & 0x2) || s->isInternalParallel()) {
     ret->u.cond.is_shared = 1;
   }
   return ret;
diff --git a/test/92.act b/test/92.act
new file mode 100644
index 0000000..20f4001
--- /dev/null
+++ b/test/92.act
@@ -0,0 +1,17 @@
+defproc my_source(chan!(enum<1>) X) {
+  chp {
+    X!0; X!4; X!3
+  } 
+} 
+
+defproc my_sink(chan?(enum<1>) X) {
+  enum<1> x;
+  chp {
+    *[ X?x; log(x) ]
+  } 
+} 
+
+defproc test() {
+  my_source s;
+  my_sink t(s.X);
+}
diff --git a/test/93.act b/test/93.act
new file mode 100644
index 0000000..d99c1f4
--- /dev/null
+++ b/test/93.act
@@ -0,0 +1,15 @@
+defproc test()
+{
+   bool xr, xa;
+
+   chp {
+     (xr-; xr+; [xa]; xr-; [~xa]; log ("hi");
+	 xr+; [xa]; xr-; [~xa]; log ("hi");
+	 xr+; [xa]; xr-; [~xa]; log ("hi");
+	 xr+; [xa]; xr-; [~xa]; log ("hi");
+	 xr+; [xa]; xr-; [~xa]; log ("hi");
+	 xr+; [xa]; xr-; [~xa]; log ("hi")   )
+||  
+     (xa-; *[ [xr]; xa+; [~xr]; xa- ])
+   }
+}
diff --git a/test/runs/92.act.stderr b/test/runs/92.act.stderr
new file mode 100644
index 0000000..32ed59f
--- /dev/null
+++ b/test/runs/92.act.stderr
@@ -0,0 +1,4 @@
+WARNING: my_sink<>: substituting chp model (requested prs, not found)
+WARNING: my_source<>: substituting chp model (requested prs, not found)
+** FATAL ** Process my_sink<>: enumeration assigned illegal value
+**   Max=1;  Value: 4 (0x4)
diff --git a/test/runs/92.act.stdout b/test/runs/92.act.stdout
new file mode 100644
index 0000000..446bfae
--- /dev/null
+++ b/test/runs/92.act.stdout
@@ -0,0 +1 @@
+[                  10] <t>  0
diff --git a/test/runs/93.act.stderr b/test/runs/93.act.stderr
new file mode 100644
index 0000000..78d54cb
--- /dev/null
+++ b/test/runs/93.act.stderr
@@ -0,0 +1 @@
+WARNING: test<>: substituting chp model (requested prs, not found)
diff --git a/test/runs/93.act.stdout b/test/runs/93.act.stdout
new file mode 100644
index 0000000..3af8cfe
--- /dev/null
+++ b/test/runs/93.act.stdout
@@ -0,0 +1,6 @@
+[                  50] <>  hi
+[                  90] <>  hi
+[                 130] <>  hi
+[                 170] <>  hi
+[                 210] <>  hi
+[                 250] <>  hi