diff --git a/core/control-plane/control-plane-transform/src/main/java/org/eclipse/edc/connector/controlplane/transform/odrl/from/JsonObjectFromPolicyTransformer.java b/core/control-plane/control-plane-transform/src/main/java/org/eclipse/edc/connector/controlplane/transform/odrl/from/JsonObjectFromPolicyTransformer.java
index 1364bd0b742..884c38855ff 100644
--- a/core/control-plane/control-plane-transform/src/main/java/org/eclipse/edc/connector/controlplane/transform/odrl/from/JsonObjectFromPolicyTransformer.java
+++ b/core/control-plane/control-plane-transform/src/main/java/org/eclipse/edc/connector/controlplane/transform/odrl/from/JsonObjectFromPolicyTransformer.java
@@ -133,7 +133,8 @@ private JsonObject visitMultiplicityConstraint(String operandType, MultiplicityC
         public JsonObject visitAtomicConstraint(AtomicConstraint atomicConstraint) {
             var constraintBuilder = jsonFactory.createObjectBuilder();
 
-            constraintBuilder.add(ODRL_LEFT_OPERAND_ATTRIBUTE, atomicConstraint.getLeftExpression().accept(this));
+            var leftOperand = atomicConstraint.getLeftExpression().accept((expression) -> expression.getValue().toString());
+            constraintBuilder.add(ODRL_LEFT_OPERAND_ATTRIBUTE, jsonFactory.createArrayBuilder().add(jsonFactory.createObjectBuilder().add(ID, leftOperand)));
             var operator = atomicConstraint.getOperator().getOdrlRepresentation();
             constraintBuilder.add(ODRL_OPERATOR_ATTRIBUTE, jsonFactory.createArrayBuilder().add(jsonFactory.createObjectBuilder().add(ID, operator)));
             constraintBuilder.add(ODRL_RIGHT_OPERAND_ATTRIBUTE, atomicConstraint.getRightExpression().accept(this));
diff --git a/core/control-plane/control-plane-transform/src/test/java/org/eclipse/edc/connector/controlplane/transform/odrl/from/JsonObjectFromPolicyTransformerTest.java b/core/control-plane/control-plane-transform/src/test/java/org/eclipse/edc/connector/controlplane/transform/odrl/from/JsonObjectFromPolicyTransformerTest.java
index e0ea3f2c02d..37903dc2db0 100644
--- a/core/control-plane/control-plane-transform/src/test/java/org/eclipse/edc/connector/controlplane/transform/odrl/from/JsonObjectFromPolicyTransformerTest.java
+++ b/core/control-plane/control-plane-transform/src/test/java/org/eclipse/edc/connector/controlplane/transform/odrl/from/JsonObjectFromPolicyTransformerTest.java
@@ -181,7 +181,7 @@ void transform_actionWithAllAttributes_returnJsonObject() {
         assertThat(actionJson.getJsonObject(ODRL_REFINEMENT_ATTRIBUTE)).isNotNull();
 
         var constraintJson = actionJson.getJsonObject(ODRL_REFINEMENT_ATTRIBUTE);
-        assertThat(constraintJson.getJsonObject(ODRL_LEFT_OPERAND_ATTRIBUTE).getJsonString(VALUE).getString())
+        assertThat(constraintJson.getJsonArray(ODRL_LEFT_OPERAND_ATTRIBUTE).getJsonObject(0).getString(ID))
                 .isEqualTo(((LiteralExpression) constraint.getLeftExpression()).getValue());
         assertThat(constraintJson.getJsonArray(ODRL_OPERATOR_ATTRIBUTE).getJsonObject(0).getString(ID))
                 .isEqualTo(constraint.getOperator().getOdrlRepresentation());
@@ -221,7 +221,7 @@ void transform_permissionWithConstraintAndDuty_returnJsonObject() {
         assertThat(permissionJson.getJsonArray(ODRL_DUTY_ATTRIBUTE)).hasSize(1);
 
         var constraintJson = permissionJson.getJsonArray(ODRL_CONSTRAINT_ATTRIBUTE).get(0).asJsonObject();
-        assertThat(constraintJson.getJsonObject(ODRL_LEFT_OPERAND_ATTRIBUTE).getJsonString(VALUE).getString())
+        assertThat(constraintJson.getJsonArray(ODRL_LEFT_OPERAND_ATTRIBUTE).getJsonObject(0).getString(ID))
                 .isEqualTo(((LiteralExpression) constraint.getLeftExpression()).getValue());
         assertThat(constraintJson.getJsonArray(ODRL_OPERATOR_ATTRIBUTE).getJsonObject(0).getString(ID))
                 .isEqualTo(constraint.getOperator().getOdrlRepresentation());
@@ -253,7 +253,7 @@ void transform_prohibitionWithConstraint_returnJsonObject() {
         assertThat(prohibitionJson.getJsonArray(ODRL_CONSTRAINT_ATTRIBUTE)).hasSize(1);
 
         var constraintJson = prohibitionJson.getJsonArray(ODRL_CONSTRAINT_ATTRIBUTE).get(0).asJsonObject();
-        assertThat(constraintJson.getJsonObject(ODRL_LEFT_OPERAND_ATTRIBUTE).getJsonString(VALUE).getString())
+        assertThat(constraintJson.getJsonArray(ODRL_LEFT_OPERAND_ATTRIBUTE).getJsonObject(0).getString(ID))
                 .isEqualTo(((LiteralExpression) constraint.getLeftExpression()).getValue());
         assertThat(constraintJson.getJsonArray(ODRL_OPERATOR_ATTRIBUTE).getJsonObject(0).getString(ID))
                 .isEqualTo(constraint.getOperator().getOdrlRepresentation());
@@ -289,7 +289,7 @@ void transform_dutyWithConstraintAndConsequence_returnJsonObject() {
         assertThat(dutyJson.getJsonArray(ODRL_CONSTRAINT_ATTRIBUTE)).hasSize(1);
 
         var constraintJson = dutyJson.getJsonArray(ODRL_CONSTRAINT_ATTRIBUTE).get(0).asJsonObject();
-        assertThat(constraintJson.getJsonObject(ODRL_LEFT_OPERAND_ATTRIBUTE).getJsonString(VALUE).getString())
+        assertThat(constraintJson.getJsonArray(ODRL_LEFT_OPERAND_ATTRIBUTE).getJsonObject(0).getString(ID))
                 .isEqualTo(((LiteralExpression) constraint.getLeftExpression()).getValue());
         assertThat(constraintJson.getJsonArray(ODRL_OPERATOR_ATTRIBUTE).getJsonObject(0).getString(ID))
                 .isEqualTo(constraint.getOperator().getOdrlRepresentation());