diff --git a/TestCases/compliance-level-3/0099-arithmetic-negation/0099-arithmetic-negation-test-01.xml b/TestCases/compliance-level-3/0099-arithmetic-negation/0099-arithmetic-negation-test-01.xml
index a10a4c19b..fa5af9301 100644
--- a/TestCases/compliance-level-3/0099-arithmetic-negation/0099-arithmetic-negation-test-01.xml
+++ b/TestCases/compliance-level-3/0099-arithmetic-negation/0099-arithmetic-negation-test-01.xml
@@ -24,45 +24,41 @@
         </resultNode>
     </testCase>
 
-    <!-- commented as per https://github.com/dmn-tck/tck/pull/401#issuecomment-962982239 -->
-<!--    <testCase id="decision_003">-->
-<!--        <description>negate days and time duration</description>-->
-<!--        <resultNode name="decision_003" type="decision">-->
-<!--            <expected>-->
-<!--                <value xsi:type="xsd:duration">-P1D</value>-->
-<!--            </expected>-->
-<!--        </resultNode>-->
-<!--    </testCase>-->
+    <testCase id="decision_003">
+        <description>negate days and time duration</description>
+        <resultNode name="decision_003" type="decision">
+            <expected>
+                <value xsi:type="xsd:duration">-P1D</value>
+            </expected>
+        </resultNode>
+    </testCase>
 
-    <!-- commented as per https://github.com/dmn-tck/tck/pull/401#issuecomment-962982239 -->
-<!--    <testCase id="decision_003_a">-->
-<!--        <description>negate a negative days and time duration</description>-->
-<!--        <resultNode name="decision_003_a" type="decision">-->
-<!--            <expected>-->
-<!--                <value xsi:type="xsd:duration">P1D</value>-->
-<!--            </expected>-->
-<!--        </resultNode>-->
-<!--    </testCase>-->
+    <testCase id="decision_003_a">
+        <description>negate a negative days and time duration</description>
+        <resultNode name="decision_003_a" type="decision">
+            <expected>
+                <value xsi:type="xsd:duration">P1D</value>
+            </expected>
+        </resultNode>
+    </testCase>
 
-    <!-- commented as per https://github.com/dmn-tck/tck/pull/401#issuecomment-962982239 -->
-<!--    <testCase id="decision_004">-->
-<!--        <description>negate years and months duration</description>-->
-<!--        <resultNode name="decision_004" type="decision">-->
-<!--            <expected>-->
-<!--                <value xsi:type="xsd:duration">-P1Y</value>-->
-<!--            </expected>-->
-<!--        </resultNode>-->
-<!--    </testCase>-->
+    <testCase id="decision_004">
+        <description>negate years and months duration</description>
+        <resultNode name="decision_004" type="decision">
+            <expected>
+                <value xsi:type="xsd:duration">-P1Y</value>
+            </expected>
+        </resultNode>
+    </testCase>
 
-    <!-- commented as per https://github.com/dmn-tck/tck/pull/401#issuecomment-962982239 -->
-<!--    <testCase id="decision_004_a">-->
-<!--        <description>negate a negative years and months duration</description>-->
-<!--        <resultNode name="decision_004_a" type="decision">-->
-<!--            <expected>-->
-<!--                <value xsi:type="xsd:duration">P1Y</value>-->
-<!--            </expected>-->
-<!--        </resultNode>-->
-<!--    </testCase>-->
+    <testCase id="decision_004_a">
+        <description>negate a negative years and months duration</description>
+        <resultNode name="decision_004_a" type="decision">
+            <expected>
+                <value xsi:type="xsd:duration">P1Y</value>
+            </expected>
+        </resultNode>
+    </testCase>
 
     <testCase id="decision_005">
         <description>negate date gives null</description>
diff --git a/TestCases/compliance-level-3/0099-arithmetic-negation/0099-arithmetic-negation.dmn b/TestCases/compliance-level-3/0099-arithmetic-negation/0099-arithmetic-negation.dmn
index c6d0d46b8..a738f4ce8 100644
--- a/TestCases/compliance-level-3/0099-arithmetic-negation/0099-arithmetic-negation.dmn
+++ b/TestCases/compliance-level-3/0099-arithmetic-negation/0099-arithmetic-negation.dmn
@@ -3,10 +3,7 @@
              name="0099-arithmetic-negation"
              id="_i9fboPUUEeesLuP4RHs4vA"
              xmlns="https://www.omg.org/spec/DMN/20230324/MODEL/"
-             xmlns:di="http://www.omg.org/spec/DMN/20180521/DI/"
-             xmlns:dmndi="https://www.omg.org/spec/DMN/20230324/DMNDI/"
-             xmlns:dc="http://www.omg.org/spec/DMN/20180521/DC/"
-             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+>
     <description>arithmetic negation</description>
 
     <decision name="decision_001" id="_decision_001">
@@ -23,37 +20,33 @@
         </literalExpression>
     </decision>
 
-    <!-- commented as per https://github.com/dmn-tck/tck/pull/401#issuecomment-962982239 -->
-<!--    <decision name="decision_003" id="_decision_003">-->
-<!--        <variable name="decision_003"/>-->
-<!--        <literalExpression>-->
-<!--            <text>-@"P1D"</text>-->
-<!--        </literalExpression>-->
-<!--    </decision>-->
-
-    <!-- commented as per https://github.com/dmn-tck/tck/pull/401#issuecomment-962982239 -->
-<!--    <decision name="decision_003_a" id="_decision_003_a">-->
-<!--        <variable name="decision_003_a"/>-->
-<!--        <literalExpression>-->
-<!--            <text>-@"-P1D"</text>-->
-<!--        </literalExpression>-->
-<!--    </decision>-->
-
-    <!-- commented as per https://github.com/dmn-tck/tck/pull/401#issuecomment-962982239 -->
-<!--    <decision name="decision_004" id="_decision_004">-->
-<!--        <variable name="decision_004"/>-->
-<!--        <literalExpression>-->
-<!--            <text>-@"P1Y"</text>-->
-<!--        </literalExpression>-->
-<!--    </decision>-->
-
-    <!-- commented as per https://github.com/dmn-tck/tck/pull/401#issuecomment-962982239 -->
-<!--    <decision name="decision_004_a" id="_decision_004_a">-->
-<!--        <variable name="decision_004_a"/>-->
-<!--        <literalExpression>-->
-<!--            <text>-@"-P1Y"</text>-->
-<!--        </literalExpression>-->
-<!--    </decision>-->
+    <decision name="decision_003" id="_decision_003">
+        <variable name="decision_003"/>
+        <literalExpression>
+            <text>-@"P1D"</text>
+        </literalExpression>
+    </decision>
+
+    <decision name="decision_003_a" id="_decision_003_a">
+        <variable name="decision_003_a"/>
+        <literalExpression>
+            <text>-@"-P1D"</text>
+        </literalExpression>
+    </decision>
+
+    <decision name="decision_004" id="_decision_004">
+        <variable name="decision_004"/>
+        <literalExpression>
+            <text>-@"P1Y"</text>
+        </literalExpression>
+    </decision>
+
+    <decision name="decision_004_a" id="_decision_004_a">
+        <variable name="decision_004_a"/>
+        <literalExpression>
+            <text>-@"-P1Y"</text>
+        </literalExpression>
+    </decision>
 
     <decision name="decision_005" id="_decision_005">
         <variable name="decision_005"/>