diff --git a/resources/modelica_libraries/CRMLtoModelica.mo b/resources/modelica_libraries/CRMLtoModelica.mo
index 40afd58..ea380b5 100644
--- a/resources/modelica_libraries/CRMLtoModelica.mo
+++ b/resources/modelica_libraries/CRMLtoModelica.mo
@@ -87,7 +87,7 @@ end CRMLClock;
     CRMLPeriod P;
     
     equation
-    P.is_open = true;
+    P.is_open = if( CRMLtoModelica.Functions.Event2Boolean (P.start_event) and not CRMLtoModelica.Functions.Event2Boolean (P.close_event))then true else false;
       
 
     end CRMLPeriod_build;
@@ -283,11 +283,11 @@ end cvBooleanToBoolean4;
     function Event2Boolean
     input Types.Event e;
     
-    output Types.Boolean4 b;
+    output Boolean b;
     
     algorithm
     
-    b:=e.b;
+    b:=if(e.b == CRMLtoModelica.Types.Boolean4.true4)then true else false;
 
     end Event2Boolean;
 
@@ -563,4 +563,4 @@ end cvBooleanToBoolean4;
 annotation(
     Icon(graphics = {Ellipse(origin = {5, -2}, fillColor = {0, 143, 0}, fillPattern = FillPattern.Solid, extent = {{-59, 58}, {59, -58}})}));
   
-end CRMLtoModelica;
+end CRMLtoModelica;
\ No newline at end of file