diff --git a/CHANGELOG.adoc b/CHANGELOG.adoc
index f7f4f7281..491f35a13 100644
--- a/CHANGELOG.adoc
+++ b/CHANGELOG.adoc
@@ -38,6 +38,7 @@ The property `SysONTestsProperties#ELASTICSEARCH` has been removed, tests that r
 - https://github.com/eclipse-syson/syson/issues/1860[#1860] [diagrams] Add a precondition for compartment item node descriptions in order to filter out unwanted types.
 For example `ViewUsage` elements are no longer rendered in _parts_ compartments.
 - https://github.com/eclipse-syson/syson/issues/1981[#1981] [export] Fix an error during textual export where `Expose` elements with apostrophes in their name were not properly escaped.
+- https://github.com/eclipse-syson/syson/issues/1983[#1983] [metamodel] `reqId` and `declaredShortName` properties of `RequirementDefinition` and `RequirementUsage` are now synchronized, as required by the SysMLv2 specification.
 
 === Improvements
 
@@ -65,6 +66,7 @@ Also add a  _New Satisfy Requirement_ graphical edge tool between `Feature` grap
 As a result, the application won't start if a service call is constructed with an invalid number of arguments.
 - https://github.com/eclipse-syson/syson/issues/1988[#1988] [syson] Extract Elasticsearch container initialization in a dedicated abstract test class.
 Integration tests that require Elasticsearch now need to extend `AbstractIntegrationTestsWithElasticsearch`.
+- https://github.com/eclipse-syson/syson/issues/1983[#1983] [details] `reqId` property of `RequirementDefinition` is now visible in the _Core_ tab of the _Details_ view.
 
 === New features
 
diff --git a/backend/application/syson-application-configuration/src/main/java/org/eclipse/syson/application/services/CoreFeaturesSwitch.java b/backend/application/syson-application-configuration/src/main/java/org/eclipse/syson/application/services/CoreFeaturesSwitch.java
index 629dd0cb8..58b83c21e 100644
--- a/backend/application/syson-application-configuration/src/main/java/org/eclipse/syson/application/services/CoreFeaturesSwitch.java
+++ b/backend/application/syson-application-configuration/src/main/java/org/eclipse/syson/application/services/CoreFeaturesSwitch.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2023, 2025 Obeo.
+ * Copyright (c) 2023, 2026 Obeo.
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v2.0
  * which accompanies this distribution, and is available at
@@ -37,6 +37,7 @@
 import org.eclipse.syson.sysml.Redefinition;
 import org.eclipse.syson.sysml.ReferenceSubsetting;
 import org.eclipse.syson.sysml.RequirementConstraintMembership;
+import org.eclipse.syson.sysml.RequirementDefinition;
 import org.eclipse.syson.sysml.RequirementUsage;
 import org.eclipse.syson.sysml.Specialization;
 import org.eclipse.syson.sysml.StateDefinition;
@@ -231,6 +232,14 @@ public List<EStructuralFeature> caseRequirementConstraintMembership(RequirementC
         return features;
     }
 
+    @Override
+    public List<EStructuralFeature> caseRequirementDefinition(RequirementDefinition object) {
+        var features = new ArrayList<EStructuralFeature>();
+        features.addAll(this.caseElement(object));
+        features.add(SysmlPackage.eINSTANCE.getRequirementDefinition_ReqId());
+        return features;
+    }
+
     @Override
     public List<EStructuralFeature> caseRequirementUsage(RequirementUsage object) {
         var features = new ArrayList<EStructuralFeature>();
diff --git a/backend/application/syson-application-configuration/src/test/java/org/eclipse/syson/application/services/DetailsViewServiceTest.java b/backend/application/syson-application-configuration/src/test/java/org/eclipse/syson/application/services/DetailsViewServiceTest.java
index affb81e96..525ec2db1 100644
--- a/backend/application/syson-application-configuration/src/test/java/org/eclipse/syson/application/services/DetailsViewServiceTest.java
+++ b/backend/application/syson-application-configuration/src/test/java/org/eclipse/syson/application/services/DetailsViewServiceTest.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2024, 2025 Obeo.
+ * Copyright (c) 2024, 2026 Obeo.
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v2.0
  * which accompanies this distribution, and is available at
@@ -78,6 +78,15 @@ public void getCoreFeaturesOfMembership() {
                 SysmlPackage.eINSTANCE.getMembership_MemberElement());
     }
 
+    @Test
+    public void getCoreFeaturesOfRequirementDefinition() {
+        List<EStructuralFeature> coreStructuralFeatures = this.detailsViewService.getCoreFeatures(SysmlFactory.eINSTANCE.createRequirementDefinition());
+        assertThat(coreStructuralFeatures).containsOnly(SysmlPackage.eINSTANCE.getElement_DeclaredName(),
+                SysmlPackage.eINSTANCE.getElement_QualifiedName(),
+                SysmlPackage.eINSTANCE.getElement_DeclaredShortName(),
+                SysmlPackage.eINSTANCE.getRequirementDefinition_ReqId());
+    }
+
     @Test
     public void getCoreFeaturesOfRequirementUsage() {
         List<EStructuralFeature> coreStructuralFeatures = this.detailsViewService.getCoreFeatures(SysmlFactory.eINSTANCE.createRequirementUsage());
diff --git a/backend/metamodel/syson-sysml-metamodel/src/main/java/org/eclipse/syson/sysml/impl/RequirementDefinitionImpl.java b/backend/metamodel/syson-sysml-metamodel/src/main/java/org/eclipse/syson/sysml/impl/RequirementDefinitionImpl.java
index f47fa8e7d..1df6fc262 100644
--- a/backend/metamodel/syson-sysml-metamodel/src/main/java/org/eclipse/syson/sysml/impl/RequirementDefinitionImpl.java
+++ b/backend/metamodel/syson-sysml-metamodel/src/main/java/org/eclipse/syson/sysml/impl/RequirementDefinitionImpl.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
-* Copyright (c) 2023, 2025 Obeo.
+* Copyright (c) 2023, 2026 Obeo.
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v2.0
 * which accompanies this distribution, and is available at
@@ -349,4 +349,23 @@ public String toString() {
         return result.toString();
     }
 
+    /**
+     * <!-- begin-user-doc --> Redefines getter <!-- end-user-doc -->
+     *
+     * @generated NOT
+     */
+    @Override
+    public String getDeclaredShortName() {
+        return this.getReqId();
+    }
+
+    /**
+     * <!-- begin-user-doc --> Redefines setter <!-- end-user-doc -->
+     *
+     * @generated NOT
+     */
+    @Override
+    public void setDeclaredShortName(String newDeclaredShortName) {
+        this.setReqId(newDeclaredShortName);
+    }
 } // RequirementDefinitionImpl
diff --git a/backend/metamodel/syson-sysml-metamodel/src/main/java/org/eclipse/syson/sysml/impl/RequirementUsageImpl.java b/backend/metamodel/syson-sysml-metamodel/src/main/java/org/eclipse/syson/sysml/impl/RequirementUsageImpl.java
index 1f31f0c2b..5352a9967 100644
--- a/backend/metamodel/syson-sysml-metamodel/src/main/java/org/eclipse/syson/sysml/impl/RequirementUsageImpl.java
+++ b/backend/metamodel/syson-sysml-metamodel/src/main/java/org/eclipse/syson/sysml/impl/RequirementUsageImpl.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2023, 2025 Obeo.
+ * Copyright (c) 2023, 2026 Obeo.
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v2.0
  * which accompanies this distribution, and is available at
@@ -401,4 +401,23 @@ public Predicate getConstraintDefinition() {
         return this.getRequirementDefinition();
     }
 
+    /**
+     * <!-- begin-user-doc --> Redefines getter <!-- end-user-doc -->
+     *
+     * @generated NOT
+     */
+    @Override
+    public String getDeclaredShortName() {
+        return this.getReqId();
+    }
+
+    /**
+     * <!-- begin-user-doc --> Redefines setter <!-- end-user-doc -->
+     *
+     * @generated NOT
+     */
+    @Override
+    public void setDeclaredShortName(String newDeclaredShortName) {
+        this.setReqId(newDeclaredShortName);
+    }
 } // RequirementUsageImpl
diff --git a/backend/metamodel/syson-sysml-metamodel/src/test/java/org/eclipse/syson/sysml/impl/RequirementDefinitionImplTest.java b/backend/metamodel/syson-sysml-metamodel/src/test/java/org/eclipse/syson/sysml/impl/RequirementDefinitionImplTest.java
index 94aa22245..cac2e010e 100644
--- a/backend/metamodel/syson-sysml-metamodel/src/test/java/org/eclipse/syson/sysml/impl/RequirementDefinitionImplTest.java
+++ b/backend/metamodel/syson-sysml-metamodel/src/test/java/org/eclipse/syson/sysml/impl/RequirementDefinitionImplTest.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2025 Obeo.
+ * Copyright (c) 2025, 2026 Obeo.
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v2.0
  * which accompanies this distribution, and is available at
@@ -12,6 +12,8 @@
  *******************************************************************************/
 package org.eclipse.syson.sysml.impl;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
 import java.util.List;
 import java.util.stream.Stream;
 
@@ -70,4 +72,14 @@ public void testGetStakeholderParameter() {
         Assertions.assertNotNull(stakeholderParameterValue);
         Assertions.assertIterableEquals(STAKEHOLDER_PART_USAGES, stakeholderParameterValue);
     }
+
+    @Test
+    public void testReqId() {
+        REQUIREMENT_DEFINITION.setReqId("REQID");
+        assertEquals("REQID", REQUIREMENT_DEFINITION.getReqId());
+        assertEquals("REQID", REQUIREMENT_DEFINITION.getDeclaredShortName());
+        REQUIREMENT_DEFINITION.setDeclaredShortName("DECLARED_SHORT_NAME");
+        assertEquals("DECLARED_SHORT_NAME", REQUIREMENT_DEFINITION.getReqId());
+        assertEquals("DECLARED_SHORT_NAME", REQUIREMENT_DEFINITION.getDeclaredShortName());
+    }
 }
diff --git a/backend/metamodel/syson-sysml-metamodel/src/test/java/org/eclipse/syson/sysml/impl/RequirementUsageImplTest.java b/backend/metamodel/syson-sysml-metamodel/src/test/java/org/eclipse/syson/sysml/impl/RequirementUsageImplTest.java
index 5666a75a4..ff3c28efb 100644
--- a/backend/metamodel/syson-sysml-metamodel/src/test/java/org/eclipse/syson/sysml/impl/RequirementUsageImplTest.java
+++ b/backend/metamodel/syson-sysml-metamodel/src/test/java/org/eclipse/syson/sysml/impl/RequirementUsageImplTest.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2025 Obeo.
+ * Copyright (c) 2025, 2026 Obeo.
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v2.0
  * which accompanies this distribution, and is available at
@@ -12,6 +12,10 @@
  *******************************************************************************/
 package org.eclipse.syson.sysml.impl;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertIterableEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
 import java.util.List;
 import java.util.stream.Stream;
 
@@ -21,7 +25,6 @@
 import org.eclipse.syson.sysml.StakeholderMembership;
 import org.eclipse.syson.sysml.SysmlFactory;
 import org.eclipse.syson.sysml.SysmlPackage;
-import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
 
@@ -60,14 +63,24 @@ public static void setUpRequirementUsage() {
     @Test
     public void testGetActorParameter() {
         final List<PartUsage> actorParameterValue = REQUIREMENT_USAGE.getActorParameter();
-        Assertions.assertNotNull(actorParameterValue);
-        Assertions.assertIterableEquals(ACTOR_PART_USAGES, actorParameterValue);
+        assertNotNull(actorParameterValue);
+        assertIterableEquals(ACTOR_PART_USAGES, actorParameterValue);
     }
 
     @Test
     public void testGetStakeholderParameter() {
         final List<PartUsage> stakeholderParameterValue = REQUIREMENT_USAGE.getStakeholderParameter();
-        Assertions.assertNotNull(stakeholderParameterValue);
-        Assertions.assertIterableEquals(STAKEHOLDER_PART_USAGES, stakeholderParameterValue);
+        assertNotNull(stakeholderParameterValue);
+        assertIterableEquals(STAKEHOLDER_PART_USAGES, stakeholderParameterValue);
+    }
+
+    @Test
+    public void testReqId() {
+        REQUIREMENT_USAGE.setReqId("REQID");
+        assertEquals("REQID", REQUIREMENT_USAGE.getReqId());
+        assertEquals("REQID", REQUIREMENT_USAGE.getDeclaredShortName());
+        REQUIREMENT_USAGE.setDeclaredShortName("DECLARED_SHORT_NAME");
+        assertEquals("DECLARED_SHORT_NAME", REQUIREMENT_USAGE.getReqId());
+        assertEquals("DECLARED_SHORT_NAME", REQUIREMENT_USAGE.getDeclaredShortName());
     }
 }
diff --git a/doc/content/modules/user-manual/pages/release-notes/2026.3.0.adoc b/doc/content/modules/user-manual/pages/release-notes/2026.3.0.adoc
index 14671821f..38d1eb17f 100644
--- a/doc/content/modules/user-manual/pages/release-notes/2026.3.0.adoc
+++ b/doc/content/modules/user-manual/pages/release-notes/2026.3.0.adoc
@@ -61,6 +61,10 @@ part system {
 }
 ```
 
+* In _Details_ view:
+
+** `Req Id` and `Declared Short Name` properties of `RequirementDefinition` and `RequirementUsage` are now synchronized, as required by the SysMLv2 specification.
+
 == Improvements
 
 * In diagrams:
@@ -100,7 +104,13 @@ package root {
 ```
 ** Implement the textual export for `AllocationUsage` and `AllocationDefinition`.
 
-* Add support for publishing representations with libraries.
+* In _Details_ view:
+
+** `Req Id` property of `RequirementDefinition` is now visible in the _Core_ tab of the _Details_ view.
+
+* Miscellaneous:
+
+** Add support for publishing representations with libraries.
 Publishing a project that contains representations now produces libraries that also contain the representations.
 Users can navigate to `/libraries/<library identifier>` to open a library and see its representations.