diff --git a/applications/NXstress.nxdl.xml b/applications/NXstress.nxdl.xml
index 5acd9d6e6..2bb05e7e2 100644
--- a/applications/NXstress.nxdl.xml
+++ b/applications/NXstress.nxdl.xml
@@ -112,12 +112,12 @@
             </doc>
         </field>
 
-        <field name="start_time" type="NX_DATE_TIME" minOccurs="1">
+        <field name="start_time" type="NX_DATE_TIME" minOccurs="1" maxOccurs="1">
             <doc>
                 The starting time(s) of measurement(s) which can be provided in form of a list if multiple measurements are included in the same NXentry.
             </doc>
         </field>
-        <field name="end_time" type="NX_DATE_TIME" minOccurs="1">
+        <field name="end_time" type="NX_DATE_TIME" minOccurs="1" maxOccurs="1">
             <doc>
                 The end time(s) of measurement(s) which can be provided in form of a list if multiple measurements are included in the same NXentry.
             </doc>
@@ -309,7 +309,7 @@
                         group* within the *NXdetector group*.
                     </doc>
                 </field>
-                <group type="NXtransformations" minOccurs="0">
+                <group type="NXtransformations" minOccurs="0" maxOccurs="1">
                     <doc>
                         This is the recommended location for detector goniometer
                         and other related axes.
@@ -493,7 +493,7 @@
                     </doc>
                 </field>
             </group>
-            <group type="NXtransformations" minOccurs="0">
+            <group type="NXtransformations" minOccurs="0" maxOccurs="1">
                 <doc>
                 This is the recommended location for sample goniometer
                 and other related axes.
@@ -899,7 +899,7 @@
                     </dimensions>
                 </field>
 
-                <field name="background" type="NX_NUMBER" minOccurs="0">
+                <field name="background" type="NX_NUMBER" minOccurs="0" maxOccurs="1">
                     <doc>In case the diffraction background was manually determined. Diffractogram background counts (auxiliary signal).</doc>
                     <dimensions rank="2">
                         <dim index="1" value="nD" />
@@ -911,7 +911,7 @@
                         </enumeration>
                     </attribute>
                 </field>
-                <field name="residuals" type="NX_NUMBER" minOccurs="0">
+                <field name="residuals" type="NX_NUMBER" minOccurs="0" maxOccurs="1">
                     <doc>Difference between diffractogram and fit (auxiliary signal).</doc>
                     <dimensions rank="2">
                         <dim index="1" value="nD" />