diff --git a/plugins/org.obeonetwork.m2doc/src/org/obeonetwork/m2doc/services/M2DocTemplateService.java b/plugins/org.obeonetwork.m2doc/src/org/obeonetwork/m2doc/services/M2DocTemplateService.java
index cfd186048..c219d4454 100644
--- a/plugins/org.obeonetwork.m2doc/src/org/obeonetwork/m2doc/services/M2DocTemplateService.java
+++ b/plugins/org.obeonetwork.m2doc/src/org/obeonetwork/m2doc/services/M2DocTemplateService.java
@@ -80,16 +80,6 @@ public class M2DocTemplateService extends AbstractService<Template> {
      */
     private final int numberOfParameters;
 
-    /**
-     * The {@link Set} of returned {@link IType}.
-     */
-    private final Set<IType> returnTypes;
-
-    /**
-     * The {@link List} of parameter {@link IType}.
-     */
-    private final List<IType> parameterTypes;
-
     /**
      * {@link Exception} during initialization.
      */
@@ -142,19 +132,9 @@ public M2DocTemplateService(Template template, byte[] serializedDocument, M2DocE
         this.numberOfParameters = template.getParameters().size();
         this.serializedDocument = serializedDocument;
 
-        this.returnTypes = new HashSet<>();
-        returnTypes.add(new ClassType(m2docEnv.getQueryEnvironment(), GenerationResult.class));
-
-        this.parameterTypes = new ArrayList<>();
-        final AstValidator aqlValidator = new AstValidator(new ValidationServices(m2docEnv.getQueryEnvironment()));
-        for (Parameter parameter : template.getParameters()) {
-            final AstResult type = parameter.getType();
-            final IValidationResult validatationResult = aqlValidator.validate(EMPTY_VARIABLE_TYPES, type);
-            Set<IType> possibleTypes = aqlValidator.getDeclarationTypes(m2docEnv.getQueryEnvironment(),
-                    validatationResult.getPossibleTypes(type.getAst()));
-            parameterTypes.add(possibleTypes.iterator().next());
-        }
-        this.shortSignature = computeShortSignature(template);
+        final List<Set<IType>> parameterTypes = getParameterTypes(m2docEnv.getQueryEnvironment());
+        final Object[] argumentTypes = parameterTypes.toArray(new Object[parameterTypes.size()]);
+        this.shortSignature = serviceShortSignature(argumentTypes);
 
         if (serializedDocument != null) {
             try {
@@ -167,19 +147,6 @@ public M2DocTemplateService(Template template, byte[] serializedDocument, M2DocE
         }
     }
 
-    /**
-     * Computes the {@link #getShortSignature() short signature}.
-     * 
-     * @param t
-     *            the {@link Template}
-     * @return the {@link #getShortSignature() short signature}
-     */
-    private String computeShortSignature(Template t) {
-        final IType[] argumentTypes = parameterTypes.toArray(new IType[parameterTypes.size()]);
-
-        return serviceShortSignature(argumentTypes);
-    }
-
     @Override
     public String getName() {
         return getOrigin().getName();
@@ -195,11 +162,6 @@ public String getLongSignature() {
         return EcoreUtil.getURI(getOrigin()).toString() + " (" + getShortSignature() + ")";
     }
 
-    @Override
-    public List<IType> getParameterTypes(IReadOnlyQueryEnvironment env) {
-        return parameterTypes;
-    }
-
     @Override
     public int getNumberOfParameters() {
         return numberOfParameters;
@@ -211,13 +173,27 @@ public int getPriority() {
     }
 
     @Override
-    protected List<IType> computeParameterTypes(IReadOnlyQueryEnvironment queryEnvironment) {
-        return new ArrayList<>(computeType(queryEnvironment));
+    protected List<Set<IType>> computeParameterTypes(IReadOnlyQueryEnvironment queryEnvironment) {
+        final List<Set<IType>> res = new ArrayList<>();
+        final AstValidator aqlValidator = new AstValidator(new ValidationServices(queryEnvironment));
+        for (Parameter parameter : getOrigin().getParameters()) {
+            final AstResult type = parameter.getType();
+            final IValidationResult validatationResult = aqlValidator.validate(EMPTY_VARIABLE_TYPES, type);
+            Set<IType> possibleTypes = aqlValidator.getDeclarationTypes(m2docEnv.getQueryEnvironment(),
+                    validatationResult.getPossibleTypes(type.getAst()));
+            res.add(possibleTypes);
+        }
+
+        return res;
     }
 
     @Override
     protected Set<IType> computeType(IReadOnlyQueryEnvironment queryEnvironment) {
-        return returnTypes;
+        final Set<IType> res = new HashSet<>();
+
+        res.add(new ClassType(m2docEnv.getQueryEnvironment(), GenerationResult.class));
+
+        return res;
     }
 
     @Override
diff --git a/releng/org.obeonetwork.m2doc.targetplatforms/sirius-7.4.0/m2doc-sirius-7.4.0.target b/releng/org.obeonetwork.m2doc.targetplatforms/sirius-7.4.0/m2doc-sirius-7.4.0.target
index 26b4f9fbc..ef5fe53cb 100644
--- a/releng/org.obeonetwork.m2doc.targetplatforms/sirius-7.4.0/m2doc-sirius-7.4.0.target
+++ b/releng/org.obeonetwork.m2doc.targetplatforms/sirius-7.4.0/m2doc-sirius-7.4.0.target
@@ -76,7 +76,7 @@
       <unit id="org.eclipse.sirius.table" version="0.0.0"/>
       <unit id="org.eclipse.sirius.table.ui" version="0.0.0"/>
       <unit id="org.eclipse.sirius.runtime.ide.ui.feature.group" version="0.0.0"/>
-      <repository location="https://download.eclipse.org/sirius/updates/stable/7.4.0-S20240124-123506/2023-03/"/>
+      <repository location="https://download.eclipse.org/sirius/updates/releases/7.4.1/2023-03/"/>
     </location>
     <location includeMode="planner" includeAllPlatforms="false" includeSource="false" includeConfigurePhase="false" type="InstallableUnit">
       <unit id="org.eclipse.acceleo.query.feature.group" version="0.0.0"/>
diff --git a/releng/org.obeonetwork.m2doc.targetplatforms/sirius-7.4.0/m2doc-sirius-7.4.0.tpd b/releng/org.obeonetwork.m2doc.targetplatforms/sirius-7.4.0/m2doc-sirius-7.4.0.tpd
index 55035d135..a52e71e7c 100644
--- a/releng/org.obeonetwork.m2doc.targetplatforms/sirius-7.4.0/m2doc-sirius-7.4.0.tpd
+++ b/releng/org.obeonetwork.m2doc.targetplatforms/sirius-7.4.0/m2doc-sirius-7.4.0.tpd
@@ -75,7 +75,7 @@ location GEF-Classic  "https://download.eclipse.org/tools/gef/classic/releases/3
     org.eclipse.draw2d.sdk.feature.group lazy
 }
 
-location "https://download.eclipse.org/sirius/updates/stable/7.4.0-S20240124-123506/2023-03/" {
+location "https://download.eclipse.org/sirius/updates/releases/7.4.1/2023-03/" {
 	org.eclipse.sirius.runtime.feature.group lazy
 	org.eclipse.sirius lazy
 	org.eclipse.sirius.diagram lazy