diff --git a/Modelica/Mechanics/Rotational/Interfaces/PartialElementaryOneFlangeAndSupport2.mo b/Modelica/Mechanics/Rotational/Interfaces/PartialElementaryOneFlangeAndSupport2.mo
index 452a0cb3af..150420664b 100644
--- a/Modelica/Mechanics/Rotational/Interfaces/PartialElementaryOneFlangeAndSupport2.mo
+++ b/Modelica/Mechanics/Rotational/Interfaces/PartialElementaryOneFlangeAndSupport2.mo
@@ -11,7 +11,8 @@ partial model PartialElementaryOneFlangeAndSupport2
           extent={{90,-10},{110,10}})));
   Support support(phi=phi_support, tau=-flange.tau) if useSupport
     "Support/housing of component"
-    annotation (Placement(transformation(extent={{-10,-110},{10,-90}})));
+    annotation (Placement(transformation(extent={{-10,-110},{10,-90}})),
+       mustBeConnected="An enabled support connector should be connected");
 protected
   SI.Angle phi_support "Absolute angle of support flange";
 equation
diff --git a/Modelica/Mechanics/Rotational/Interfaces/PartialElementaryRotationalToTranslational.mo b/Modelica/Mechanics/Rotational/Interfaces/PartialElementaryRotationalToTranslational.mo
index 6a40e916eb..f44cd0fb73 100644
--- a/Modelica/Mechanics/Rotational/Interfaces/PartialElementaryRotationalToTranslational.mo
+++ b/Modelica/Mechanics/Rotational/Interfaces/PartialElementaryRotationalToTranslational.mo
@@ -20,10 +20,12 @@ partial model PartialElementaryRotationalToTranslational
           extent={{90,10},{110,-10}})));
   Rotational.Interfaces.Support supportR if useSupportR
     "Rotational support/housing of component" annotation (Placement(
-        transformation(extent={{-110,-110},{-90,-90}})));
+        transformation(extent={{-110,-110},{-90,-90}})),
+        mustBeConnected="An enabled support connector should be connected");
   Translational.Interfaces.Support supportT if useSupportT
     "Translational support/housing of component"
-    annotation (Placement(transformation(extent={{110,-110},{90,-90}})));
+    annotation (Placement(transformation(extent={{110,-110},{90,-90}})),
+        mustBeConnected="An enabled support connector should be connected");
 
 protected
   Rotational.Interfaces.InternalSupport internalSupportR(tau=-flangeR.tau)
diff --git a/Modelica/Mechanics/Rotational/Interfaces/PartialElementaryTwoFlangesAndSupport2.mo b/Modelica/Mechanics/Rotational/Interfaces/PartialElementaryTwoFlangesAndSupport2.mo
index 3d7c367503..4cc33e7773 100644
--- a/Modelica/Mechanics/Rotational/Interfaces/PartialElementaryTwoFlangesAndSupport2.mo
+++ b/Modelica/Mechanics/Rotational/Interfaces/PartialElementaryTwoFlangesAndSupport2.mo
@@ -13,7 +13,8 @@ partial model PartialElementaryTwoFlangesAndSupport2
         transformation(extent={{90,-10},{110,10}})));
   Support support(phi=phi_support, tau=-flange_a.tau - flange_b.tau) if
     useSupport "Support/housing of component"
-    annotation (Placement(transformation(extent={{-10,-110},{10,-90}})));
+    annotation (Placement(transformation(extent={{-10,-110},{10,-90}})),
+    mustBeConnected="An enabled support connector should be connected");
 protected
   SI.Angle phi_support "Absolute angle of support flange";
 equation
diff --git a/Modelica/Mechanics/Rotational/Interfaces/PartialOneFlangeAndSupport.mo b/Modelica/Mechanics/Rotational/Interfaces/PartialOneFlangeAndSupport.mo
index c5d416dabe..867544690c 100644
--- a/Modelica/Mechanics/Rotational/Interfaces/PartialOneFlangeAndSupport.mo
+++ b/Modelica/Mechanics/Rotational/Interfaces/PartialOneFlangeAndSupport.mo
@@ -10,7 +10,8 @@ partial model PartialOneFlangeAndSupport
   Flange_b flange "Flange of shaft" annotation (Placement(transformation(
           extent={{90,-10},{110,10}})));
   Support support if useSupport "Support/housing of component"
-    annotation (Placement(transformation(extent={{-10,-110},{10,-90}})));
+    annotation (Placement(transformation(extent={{-10,-110},{10,-90}})),
+      mustBeConnected="An enabled support connector should be connected");
 protected
   Support internalSupport
     "Internal support/housing of component (either connected to support, if useSupport=true, or connected to fixed, if useSupport=false)"
diff --git a/Modelica/Mechanics/Rotational/Interfaces/PartialTwoFlangesAndSupport.mo b/Modelica/Mechanics/Rotational/Interfaces/PartialTwoFlangesAndSupport.mo
index 035010ee49..138749ebba 100644
--- a/Modelica/Mechanics/Rotational/Interfaces/PartialTwoFlangesAndSupport.mo
+++ b/Modelica/Mechanics/Rotational/Interfaces/PartialTwoFlangesAndSupport.mo
@@ -12,7 +12,8 @@ partial model PartialTwoFlangesAndSupport
   Flange_b flange_b "Flange of right shaft" annotation (Placement(
         transformation(extent={{90,-10},{110,10}})));
   Support support if useSupport "Support/housing of component"
-    annotation (Placement(transformation(extent={{-10,-110},{10,-90}})));
+    annotation (Placement(transformation(extent={{-10,-110},{10,-90}})),
+      mustBeConnected="An enabled support connector should be connected");
 protected
   Support internalSupport
     "Internal support/housing of component (either connected to support, if useSupport=true, or connected to fixed, if useSupport=false)"
diff --git a/Modelica/Mechanics/Translational/Interfaces/PartialElementaryOneFlangeAndSupport2.mo b/Modelica/Mechanics/Translational/Interfaces/PartialElementaryOneFlangeAndSupport2.mo
index aff7e8a8ed..99e595e6e1 100644
--- a/Modelica/Mechanics/Translational/Interfaces/PartialElementaryOneFlangeAndSupport2.mo
+++ b/Modelica/Mechanics/Translational/Interfaces/PartialElementaryOneFlangeAndSupport2.mo
@@ -13,7 +13,8 @@ partial model PartialElementaryOneFlangeAndSupport2
         transformation(extent={{90,-10},{110,10}})));
   Support support(s=s_support, f=-flange.f) if useSupport
     "Support/housing of component"
-    annotation (Placement(transformation(extent={{-10,-110},{10,-90}})));
+    annotation (Placement(transformation(extent={{-10,-110},{10,-90}})),
+      mustBeConnected="An enabled support connector should be connected");
 protected
   SI.Length s_support "Absolute position of support flange";
 equation
diff --git a/Modelica/Mechanics/Translational/Interfaces/PartialElementaryTwoFlangesAndSupport2.mo b/Modelica/Mechanics/Translational/Interfaces/PartialElementaryTwoFlangesAndSupport2.mo
index 777309fdce..b2a0de6f1d 100644
--- a/Modelica/Mechanics/Translational/Interfaces/PartialElementaryTwoFlangesAndSupport2.mo
+++ b/Modelica/Mechanics/Translational/Interfaces/PartialElementaryTwoFlangesAndSupport2.mo
@@ -10,7 +10,8 @@ partial model PartialElementaryTwoFlangesAndSupport2
   extends Translational.Interfaces.PartialTwoFlanges;
   Support support(s=s_support, f=-flange_a.f - flange_b.f) if useSupport
     "Support/housing of component"
-    annotation (Placement(transformation(extent={{-10,-110},{10,-90}})));
+    annotation (Placement(transformation(extent={{-10,-110},{10,-90}})),
+    mustBeConnected="An enabled support connector should be connected");
   SI.Length s_a "Distance between left flange and support";
   SI.Length s_b "Distance between right flange and support";
 protected
diff --git a/Modelica/Mechanics/Translational/Interfaces/PartialOneFlangeAndSupport.mo b/Modelica/Mechanics/Translational/Interfaces/PartialOneFlangeAndSupport.mo
index 0a73fd003d..86e24c3cb5 100644
--- a/Modelica/Mechanics/Translational/Interfaces/PartialOneFlangeAndSupport.mo
+++ b/Modelica/Mechanics/Translational/Interfaces/PartialOneFlangeAndSupport.mo
@@ -10,7 +10,8 @@ partial model PartialOneFlangeAndSupport
   Flange_b flange "Flange of component" annotation (Placement(
         transformation(extent={{90,-10},{110,10}})));
   Support support if useSupport "Support/housing of component"
-    annotation (Placement(transformation(extent={{-10,-110},{10,-90}})));
+    annotation (Placement(transformation(extent={{-10,-110},{10,-90}})),
+      mustBeConnected="An enabled support connector should be connected");
 protected
   Support internalSupport
     "Internal support/housing of component (either connected to support, if useSupport=true, or connected to fixed, if useSupport=false)"
diff --git a/Modelica/Mechanics/Translational/Interfaces/PartialTwoFlangesAndSupport.mo b/Modelica/Mechanics/Translational/Interfaces/PartialTwoFlangesAndSupport.mo
index 5cab4c8a5b..fe676f659a 100644
--- a/Modelica/Mechanics/Translational/Interfaces/PartialTwoFlangesAndSupport.mo
+++ b/Modelica/Mechanics/Translational/Interfaces/PartialTwoFlangesAndSupport.mo
@@ -9,7 +9,8 @@ partial model PartialTwoFlangesAndSupport
     choices(checkBox=true));
   extends Translational.Interfaces.PartialTwoFlanges;
   Support support if useSupport "Support/housing of component"
-    annotation (Placement(transformation(extent={{-10,-110},{10,-90}})));
+    annotation (Placement(transformation(extent={{-10,-110},{10,-90}})),
+      mustBeConnected="An enabled support connector should be connected");
 protected
   Support internalSupport
     "Internal support/housing of component (either connected to support, if useSupport=true, or connected to fixed, if useSupport=false)"