diff --git a/opm/input/eclipse/Units/UnitSystem.cpp b/opm/input/eclipse/Units/UnitSystem.cpp
index eb1e0c9da26..af3feb977b9 100644
--- a/opm/input/eclipse/Units/UnitSystem.cpp
+++ b/opm/input/eclipse/Units/UnitSystem.cpp
@@ -1536,12 +1536,18 @@ namespace {
         for( const auto& x : dimensionList ) {
             auto dim = this->getDimension( x );
 
-            // all constituing dimension must be compositable. The
+            // all constituting dimensions must be compositable. The
             // only exception is if there is the "composite" dimension
             // consists of exactly a single atomic dimension...
-            if (dimensionList.size() > 1 && !dim.isCompositable())
-                throw std::invalid_argument("Composite dimensions currently cannot require a conversion offset");
-
+            if ( !dim.isCompositable() ) {
+                if (dimensionList.size() > 1) {
+                    throw std::invalid_argument("Composite dimensions currently cannot handle conversion offsets");
+                } else {
+                    // If there is only one single dimension, and it's not compositable (involving conversion offsets),
+                    // return it directly
+                    return dim;
+                }
+            }
             SIfactor *= dim.getSIScaling();
         }
         return Dimension( SIfactor );
@@ -1560,8 +1566,9 @@ namespace {
         Dimension dividend = this->parseFactor( parts[0] );
         Dimension divisor = this->parseFactor( parts[1] );
 
-        if (dividend.getSIOffset() != 0.0 || divisor.getSIOffset() != 0.0)
-            throw std::invalid_argument("Composite dimensions cannot currently require a conversion offset");
+        if (!dividend.isCompositable() || !divisor.isCompositable()) {
+            throw std::invalid_argument("Composite dimensions currently cannot handle conversion offsets");
+        }
 
         return Dimension( dividend.getSIScaling() / divisor.getSIScaling() );
     }
diff --git a/opm/input/eclipse/share/keywords/900_OPM/G/GASJT b/opm/input/eclipse/share/keywords/900_OPM/G/GASJT
index af73f5185e4..ca56b322095 100644
--- a/opm/input/eclipse/share/keywords/900_OPM/G/GASJT
+++ b/opm/input/eclipse/share/keywords/900_OPM/G/GASJT
@@ -17,9 +17,9 @@
     {
       "name": "JOULE_THOMSON_COEFFICIENT",
       "value_type": "DOUBLE",
-      "dimension": "Temperature/Pressure",
+      "dimension": "AbsoluteTemperature/Pressure",
       "default": 0,
-      "comment": "if defaulted the JT coefficient is calculated"
+      "comment": "if defaulted the JT coefficient is calculated. Unit Temperature can not be used due to conversion offset"
     }
   ]
 }
diff --git a/opm/input/eclipse/share/keywords/900_OPM/O/OILJT b/opm/input/eclipse/share/keywords/900_OPM/O/OILJT
index 1af3e280166..0f3657c4e48 100644
--- a/opm/input/eclipse/share/keywords/900_OPM/O/OILJT
+++ b/opm/input/eclipse/share/keywords/900_OPM/O/OILJT
@@ -17,9 +17,9 @@
     {
       "name": "JOULE_THOMSON_COEFFICIENT",
       "value_type": "DOUBLE",
-      "dimension": "Temperature/Pressure",
+      "dimension": "AbsoluteTemperature/Pressure",
       "default": 0,
-      "comment": "if defaulted the JT coefficient is calculated"
+      "comment": "if defaulted the JT coefficient is calculated. Unit Temperature can not be used due to conversion offset"
     }
   ]
 }
diff --git a/opm/input/eclipse/share/keywords/900_OPM/T/THERMEXR b/opm/input/eclipse/share/keywords/900_OPM/T/THERMEXR
index 623371bc783..65d57de0c76 100644
--- a/opm/input/eclipse/share/keywords/900_OPM/T/THERMEXR
+++ b/opm/input/eclipse/share/keywords/900_OPM/T/THERMEXR
@@ -6,6 +6,7 @@
   "description": "The THERMEXR item is used to set the thermal expansion ratio for a cell in mechanics models.",
   "data": {
     "value_type": "DOUBLE",
-    "dimension": "1/Temperature"
+    "dimension": "1/AbsoluteTemperature",
+    "comment": "Unit Temperature can not be used due to conversion offset"
   }
 }
diff --git a/opm/input/eclipse/share/keywords/900_OPM/W/WATJT b/opm/input/eclipse/share/keywords/900_OPM/W/WATJT
index 92111683cd7..bc0fa0861df 100644
--- a/opm/input/eclipse/share/keywords/900_OPM/W/WATJT
+++ b/opm/input/eclipse/share/keywords/900_OPM/W/WATJT
@@ -17,9 +17,9 @@
     {
       "name": "JOULE_THOMSON_COEFFICIENT",
       "value_type": "DOUBLE",
-      "dimension": "Temperature/Pressure",
+      "dimension": "AbsoluteTemperature/Pressure",
       "default": 0,
-      "comment": "if defaulted the JT coefficient is calculated"
+      "comment": "if defaulted the JT coefficient is calculated. Unit Temperature can not be used due to conversion offset"
     }
   ]
 }