diff --git a/kie-pmml-trusty/kie-pmml-models/kie-pmml-models-drools/kie-pmml-models-drools-common/src/main/java/org/kie/pmml/models/drools/commons/model/KiePMMLDroolsModel.java b/kie-pmml-trusty/kie-pmml-models/kie-pmml-models-drools/kie-pmml-models-drools-common/src/main/java/org/kie/pmml/models/drools/commons/model/KiePMMLDroolsModel.java
index 225b80206af..045ee2b7647 100644
--- a/kie-pmml-trusty/kie-pmml-models/kie-pmml-models-drools/kie-pmml-models-drools-common/src/main/java/org/kie/pmml/models/drools/commons/model/KiePMMLDroolsModel.java
+++ b/kie-pmml-trusty/kie-pmml-models/kie-pmml-models-drools/kie-pmml-models-drools-common/src/main/java/org/kie/pmml/models/drools/commons/model/KiePMMLDroolsModel.java
@@ -49,6 +49,7 @@ public abstract class KiePMMLDroolsModel extends KiePMMLModel implements IsDrool
     private static final Logger logger = LoggerFactory.getLogger(KiePMMLDroolsModel.class);
 
     private static final AgendaEventListener agendaEventListener = getAgendaEventListener(logger);
+    private static final long serialVersionUID = 5471400949048174357L;
 
     /**
      * Map between the original field name and the generated type.
@@ -75,6 +76,7 @@ public Object evaluate(final Object knowledgeBase, Map<String, Object> requestDa
         String fullClassName = this.getClass().getName();
         String packageName = fullClassName.contains(".") ?
                 fullClassName.substring(0, fullClassName.lastIndexOf('.')) : "";
+        outputFieldsMap.clear();
         KiePMMLSessionUtils.Builder builder = KiePMMLSessionUtils.builder((KieBase) knowledgeBase, name, packageName,
                                                                           toReturn)
                 .withObjectsInSession(requestData, fieldTypeMap)
diff --git a/kie-pmml-trusty/kie-pmml-models/kie-pmml-models-drools/kie-pmml-models-drools-scorecard/kie-pmml-models-drools-scorecard-tests/src/test/java/org/kie/pmml/models/drools/scorecard/tests/SimpleScorecardCategoricalTest.java b/kie-pmml-trusty/kie-pmml-models/kie-pmml-models-drools/kie-pmml-models-drools-scorecard/kie-pmml-models-drools-scorecard-tests/src/test/java/org/kie/pmml/models/drools/scorecard/tests/SimpleScorecardCategoricalTest.java
index 309a32e5ea4..a2a9e6a586f 100644
--- a/kie-pmml-trusty/kie-pmml-models/kie-pmml-models-drools/kie-pmml-models-drools-scorecard/kie-pmml-models-drools-scorecard-tests/src/test/java/org/kie/pmml/models/drools/scorecard/tests/SimpleScorecardCategoricalTest.java
+++ b/kie-pmml-trusty/kie-pmml-models/kie-pmml-models-drools/kie-pmml-models-drools-scorecard/kie-pmml-models-drools-scorecard-tests/src/test/java/org/kie/pmml/models/drools/scorecard/tests/SimpleScorecardCategoricalTest.java
@@ -16,7 +16,6 @@
 
 package org.kie.pmml.models.drools.scorecard.tests;
 
-import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.HashMap;
@@ -35,6 +34,8 @@
 import org.kie.pmml.api.runtime.PMMLRuntime;
 import org.kie.pmml.models.tests.AbstractPMMLTest;
 
+import static org.junit.Assert.assertFalse;
+
 @RunWith(Parameterized.class)
 public class SimpleScorecardCategoricalTest extends AbstractPMMLTest {
 
@@ -43,7 +44,7 @@ public class SimpleScorecardCategoricalTest extends AbstractPMMLTest {
     private static final String TARGET_FIELD = "Score";
     private static final String REASON_CODE1_FIELD = "Reason Code 1";
     private static final String REASON_CODE2_FIELD = "Reason Code 2";
-    private static final String[] CATEGORY = new String[] { "classA", "classB", "classC", "classD", "classE", "NA" };
+    private static final String[] CATEGORY = new String[]{"classA", "classB", "classC", "classD", "classE", "NA"};
     private static PMMLRuntime pmmlRuntime;
 
     private String input1;
@@ -52,7 +53,8 @@ public class SimpleScorecardCategoricalTest extends AbstractPMMLTest {
     private String reasonCode1;
     private String reasonCode2;
 
-    public SimpleScorecardCategoricalTest(String input1, String input2, double score, String reasonCode1, String reasonCode2) {
+    public SimpleScorecardCategoricalTest(String input1, String input2, double score, String reasonCode1,
+                                          String reasonCode2) {
         this.input1 = input1;
         this.input2 = input2;
         this.score = score;
@@ -60,7 +62,7 @@ public SimpleScorecardCategoricalTest(String input1, String input2, double score
         this.reasonCode2 = reasonCode2;
     }
 
-  @BeforeClass
+    @BeforeClass
     public static void setupClass() {
         pmmlRuntime = getPMMLRuntime(FILE_NAME);
     }
@@ -93,6 +95,16 @@ public void testSimpleScorecardCategoricalVerifyNoException() {
         getSamples().stream().map(sample -> evaluate(pmmlRuntime, sample, MODEL_NAME)).forEach(Assert::assertNotNull);
     }
 
+    @Test
+    public void testSimpleScorecardCategoricalVerifyNoReasonCodeWithoutScore() {
+        getSamples().stream().map(sample -> evaluate(pmmlRuntime, sample, MODEL_NAME))
+                .filter(pmml4Result -> pmml4Result.getResultVariables().get(TARGET_FIELD) == null)
+                .forEach(pmml4Result -> {
+                    assertFalse(pmml4Result.getResultVariables().containsKey(REASON_CODE1_FIELD));
+                    assertFalse(pmml4Result.getResultVariables().containsKey(REASON_CODE2_FIELD));
+                });
+    }
+
     private List<Map<String, Object>> getSamples() {
         return IntStream.range(0, 10).boxed().map(i -> new HashMap<String, Object>() {{
             put("input1", CATEGORY[i % CATEGORY.length]);
diff --git a/kie-pmml-trusty/kie-pmml-models/kie-pmml-models-scorecard/kie-pmml-models-scorecard-model/src/main/java/org/kie/pmml/models/scorecard/model/KiePMMLScorecardModel.java b/kie-pmml-trusty/kie-pmml-models/kie-pmml-models-scorecard/kie-pmml-models-scorecard-model/src/main/java/org/kie/pmml/models/scorecard/model/KiePMMLScorecardModel.java
index 480a3756dba..cde86c6ddf7 100644
--- a/kie-pmml-trusty/kie-pmml-models/kie-pmml-models-scorecard/kie-pmml-models-scorecard-model/src/main/java/org/kie/pmml/models/scorecard/model/KiePMMLScorecardModel.java
+++ b/kie-pmml-trusty/kie-pmml-models/kie-pmml-models-scorecard/kie-pmml-models-scorecard-model/src/main/java/org/kie/pmml/models/scorecard/model/KiePMMLScorecardModel.java
@@ -66,12 +66,13 @@ public Object evaluate(final Object knowledgeBase, final Map<String, Object> req
         if (localTransformations != null) {
             derivedFields.addAll(localTransformations.getDerivedFields());
         }
+        outputFieldsMap.clear();
         return characteristics.evaluate(defineFunctions, derivedFields, kiePMMLOutputFields, requestData,
-                                        outputFieldsMap,
-                                        initialScore,
-                                        reasonCodeAlgorithm,
-                                        useReasonCodes,
-                                        baselineScore).orElse(null);
+                                                   outputFieldsMap,
+                                                             initialScore,
+                                                             reasonCodeAlgorithm,
+                                                             useReasonCodes,
+                                                             baselineScore).orElse(null);
     }
 
     @Override
diff --git a/kie-pmml-trusty/kie-pmml-models/kie-pmml-models-scorecard/kie-pmml-models-scorecard-tests/src/test/java/org/kie/pmml/models/scorecard/tests/SimpleScorecardCategoricalTest.java b/kie-pmml-trusty/kie-pmml-models/kie-pmml-models-scorecard/kie-pmml-models-scorecard-tests/src/test/java/org/kie/pmml/models/scorecard/tests/SimpleScorecardCategoricalTest.java
index 410e3d99a82..12a41e22405 100644
--- a/kie-pmml-trusty/kie-pmml-models/kie-pmml-models-scorecard/kie-pmml-models-scorecard-tests/src/test/java/org/kie/pmml/models/scorecard/tests/SimpleScorecardCategoricalTest.java
+++ b/kie-pmml-trusty/kie-pmml-models/kie-pmml-models-scorecard/kie-pmml-models-scorecard-tests/src/test/java/org/kie/pmml/models/scorecard/tests/SimpleScorecardCategoricalTest.java
@@ -34,6 +34,8 @@
 import org.kie.pmml.api.runtime.PMMLRuntime;
 import org.kie.pmml.models.tests.AbstractPMMLTest;
 
+import static org.junit.Assert.assertFalse;
+
 @RunWith(Parameterized.class)
 public class SimpleScorecardCategoricalTest extends AbstractPMMLTest {
 
@@ -42,7 +44,7 @@ public class SimpleScorecardCategoricalTest extends AbstractPMMLTest {
     private static final String TARGET_FIELD = "Score";
     private static final String REASON_CODE1_FIELD = "Reason Code 1";
     private static final String REASON_CODE2_FIELD = "Reason Code 2";
-    private static final String[] CATEGORY = new String[] { "classA", "classB", "classC", "classD", "classE", "NA" };
+    private static final String[] CATEGORY = new String[]{"classA", "classB", "classC", "classD", "classE", "NA"};
     private static PMMLRuntime pmmlRuntime;
 
     private String input1;
@@ -51,7 +53,8 @@ public class SimpleScorecardCategoricalTest extends AbstractPMMLTest {
     private String reasonCode1;
     private String reasonCode2;
 
-    public SimpleScorecardCategoricalTest(String input1, String input2, double score, String reasonCode1, String reasonCode2) {
+    public SimpleScorecardCategoricalTest(String input1, String input2, double score, String reasonCode1,
+                                          String reasonCode2) {
         this.input1 = input1;
         this.input2 = input2;
         this.score = score;
@@ -89,7 +92,18 @@ public void testSimpleScorecardCategorical() {
 
     @Test
     public void testSimpleScorecardCategoricalVerifyNoException() {
-        getSamples().stream().map(sample -> evaluate(pmmlRuntime, sample, MODEL_NAME)).forEach(Assert::assertNotNull);
+        getSamples().stream().map(sample -> evaluate(pmmlRuntime, sample, MODEL_NAME))
+                .forEach(Assert::assertNotNull);
+    }
+
+    @Test
+    public void testSimpleScorecardCategoricalVerifyNoReasonCodeWithoutScore() {
+        getSamples().stream().map(sample -> evaluate(pmmlRuntime, sample, MODEL_NAME))
+                .filter(pmml4Result -> pmml4Result.getResultVariables().get(TARGET_FIELD) == null)
+                .forEach(pmml4Result -> {
+                    assertFalse(pmml4Result.getResultVariables().containsKey(REASON_CODE1_FIELD));
+                    assertFalse(pmml4Result.getResultVariables().containsKey(REASON_CODE2_FIELD));
+                });
     }
 
     private List<Map<String, Object>> getSamples() {
@@ -98,5 +112,4 @@ private List<Map<String, Object>> getSamples() {
             put("input2", CATEGORY[Math.abs(CATEGORY.length - i) % CATEGORY.length]);
         }}).collect(Collectors.toList());
     }
-
 }