diff --git a/webapp/languages/es_GO/i18n/all_es_GO.properties b/webapp/languages/es_GO/i18n/all_es_GO.properties
index 5544aafb0..9f9b3ca3b 100644
--- a/webapp/languages/es_GO/i18n/all_es_GO.properties
+++ b/webapp/languages/es_GO/i18n/all_es_GO.properties
@@ -685,6 +685,7 @@ select_existing_collaborator = Seleccione un colaborador existente para {0}
 selected = Seleccionado
 change_selection = cambiar la selección
 there_are_no_entries_for_selection = No hay entradas en el sistema desde el cual elegir.
+the_range_class_does_not_exist= La clase de rango de esta propiedad no existe en el sistema.
 editing_prohibited = Esta propiedad no está configurado actualmente para prohibir la edición.
 confirm_entry_deletion_from = ¿Está seguro de que desea eliminar la siguiente entrada del
 
@@ -740,6 +741,7 @@ custom_template_containing_content = Plantilla personalizada que contiene todo e
 a_menu_page = Esta es una página de menú
 menu_item_name = Menu Nombre del artículo
 if_blank_page_title_used = Si se deja en blanco, se utilizará el título de la página.
+multiple_content_default_template_error = Con varios tipos de contenido , debe especificar una plantilla personalizada .
 
 label = etiqueta
 no_classes_to_select = No hay clases en el sistema desde el cual elegir.
@@ -862,3 +864,5 @@ view_labels_capitalized = Ver etiquetas
 view_labels_for = Ver Etiquetas de
 
 select_an_existing_document = Seleccione un documento existente
+
+datetime_year_required = Intervalos de fecha / hora deben empezar por un año. Ingrese una Fecha de inicio, un fin de año o los dos.
diff --git a/webapp/src/edu/cornell/mannlib/vitro/webapp/edit/n3editing/VTwo/DateTimeIntervalValidationVTwo.java b/webapp/src/edu/cornell/mannlib/vitro/webapp/edit/n3editing/VTwo/DateTimeIntervalValidationVTwo.java
index aa3ca0ed6..ae87a397c 100644
--- a/webapp/src/edu/cornell/mannlib/vitro/webapp/edit/n3editing/VTwo/DateTimeIntervalValidationVTwo.java
+++ b/webapp/src/edu/cornell/mannlib/vitro/webapp/edit/n3editing/VTwo/DateTimeIntervalValidationVTwo.java
@@ -27,6 +27,7 @@ public class DateTimeIntervalValidationVTwo implements N3ValidatorVTwo {
     
     private String startFieldName;
     private String endFieldName;
+    private String templateName;
 
     private String startValueName;
     private String endValueName;
@@ -43,6 +44,16 @@ public class DateTimeIntervalValidationVTwo implements N3ValidatorVTwo {
         endPrecisionName = endFieldName + "-precision";
     }
     
+    public DateTimeIntervalValidationVTwo(String startFieldName, String endFieldName, String template){
+        this.templateName = template;
+        this.startFieldName = startFieldName;
+        this.endFieldName = endFieldName;
+        startValueName = startFieldName + "-value";
+        endValueName = endFieldName + "-value";
+        startPrecisionName = startFieldName + "-precision";
+        endPrecisionName = endFieldName + "-precision";
+    }
+
     public Map<String, String> validate(EditConfigurationVTwo editConfig,
             MultiValueEditSubmission editSub) {
         Map<String, List<Literal>> existingLiterals = editConfig.getLiteralsInScope();
@@ -63,8 +74,13 @@ public class DateTimeIntervalValidationVTwo implements N3ValidatorVTwo {
 //            errors.put(startFieldName, "If there is an end date, there should be a start date");
 //            return errors;              
 //        }
-        
-        
+        // We need to ensure that the user has entered a start year or end year -- tlw72
+        if ( templateName != null && templateName.equals("dateTimeIntervalForm.ftl")) {
+            if ( literalListIsNull(formStartYear) && literalListIsNull(formEndYear) ) {  
+                errors.put(startFieldName, "Date/time intervals must begin with a year. Please enter a start year, an end year or both.");
+                return errors;              
+            }
+        }
         //Assuming form start year and form end year are working in conjunction with multiple values
         int index;
         if (!literalListIsNull(formStartYear) && !literalListIsNull(formEndYear)) {
diff --git a/webapp/src/edu/cornell/mannlib/vitro/webapp/edit/n3editing/configuration/generators/DateTimeIntervalFormGenerator.java b/webapp/src/edu/cornell/mannlib/vitro/webapp/edit/n3editing/configuration/generators/DateTimeIntervalFormGenerator.java
index 22c8fcb5c..7daa9743c 100644
--- a/webapp/src/edu/cornell/mannlib/vitro/webapp/edit/n3editing/configuration/generators/DateTimeIntervalFormGenerator.java
+++ b/webapp/src/edu/cornell/mannlib/vitro/webapp/edit/n3editing/configuration/generators/DateTimeIntervalFormGenerator.java
@@ -92,7 +92,7 @@ public class DateTimeIntervalFormGenerator extends
         conf.addField(startField);
         conf.addField(endField);
         //Need to add validators
-        conf.addValidator(new DateTimeIntervalValidationVTwo("startField","endField"));
+        conf.addValidator(new DateTimeIntervalValidationVTwo("startField","endField","dateTimeIntervalForm.ftl"));
         //Adding additional data, specifically edit mode
         addFormSpecificData(conf, vreq);
 	}
diff --git a/webapp/src/edu/cornell/mannlib/vitro/webapp/web/templatemodels/individual/GroupedPropertyList.java b/webapp/src/edu/cornell/mannlib/vitro/webapp/web/templatemodels/individual/GroupedPropertyList.java
index 8235202a6..866ea5404 100644
--- a/webapp/src/edu/cornell/mannlib/vitro/webapp/web/templatemodels/individual/GroupedPropertyList.java
+++ b/webapp/src/edu/cornell/mannlib/vitro/webapp/web/templatemodels/individual/GroupedPropertyList.java
@@ -20,6 +20,7 @@ import edu.cornell.mannlib.vitro.webapp.beans.ObjectProperty;
 import edu.cornell.mannlib.vitro.webapp.beans.Property;
 import edu.cornell.mannlib.vitro.webapp.beans.PropertyGroup;
 import edu.cornell.mannlib.vitro.webapp.beans.PropertyInstance;
+import edu.cornell.mannlib.vitro.webapp.beans.VClass;
 import edu.cornell.mannlib.vitro.webapp.controller.VitroRequest;
 import edu.cornell.mannlib.vitro.webapp.dao.DataPropertyDao;
 import edu.cornell.mannlib.vitro.webapp.dao.ObjectPropertyDao;
@@ -292,6 +293,14 @@ public class GroupedPropertyList extends BaseTemplateModel {
         } else if (op.getRangeVClassURI() == null) {
             return (piOp.getRangeVClassURI() != null);
         } else {
+        	//Check and see if the range vclass exists for the possible piOp and populated op properties,
+        	//because for populated properties, if the range class is a union,
+        	//blank nodes will be broken and the code should instead use the existing or piOp range class uri
+        	VClass piOpRangeClass = wadf.getVClassDao().getVClassByURI(piOp.getRangeVClassURI());
+        	VClass opRangeClass = wadf.getVClassDao().getVClassByURI(op.getRangeVClassURI());
+        	//if the possible range class exists but the populated one does not, then return true to allow the possible
+        	//class to be utilized
+        	if(piOpRangeClass != null && opRangeClass == null) return true;
             return (wadf.getVClassDao().isSubClassOf(
                     piOp.getRangeVClassURI(), op.getRangeVClassURI()));
         }
diff --git a/webapp/web/i18n/all.properties b/webapp/web/i18n/all.properties
index 818c27c4a..0fce78764 100644
--- a/webapp/web/i18n/all.properties
+++ b/webapp/web/i18n/all.properties
@@ -875,4 +875,6 @@ selection_in_process = Your selection is being processed.
 view_labels_capitalized = View Labels
 view_labels_for = View Labels for
 
-select_an_existing_document = Select an existing document
\ No newline at end of file
+select_an_existing_document = Select an existing document
+
+datetime_year_required = Date/time intervals must begin with a year. Enter either a Start Year, an End Year or both.
\ No newline at end of file
diff --git a/webapp/web/templates/freemarker/edit/forms/dateTimeIntervalForm.ftl b/webapp/web/templates/freemarker/edit/forms/dateTimeIntervalForm.ftl
index c7139c5c6..f61c42b61 100644
--- a/webapp/web/templates/freemarker/edit/forms/dateTimeIntervalForm.ftl
+++ b/webapp/web/templates/freemarker/edit/forms/dateTimeIntervalForm.ftl
@@ -58,7 +58,7 @@
  <#if htmlForElements?keys?seq_contains("endField")>
 	${i18n().end_capitalized}&nbsp; ${htmlForElements["endField"]}
  </#if>
-
+    <span class="requiredHint"> *${i18n().datetime_year_required}</span>
     <p class="submit">
         <input type="hidden" name="editKey" value="${editKey}" />
         <input type="submit" id="submit" value="${submitButtonText}" role="button" />
@@ -69,8 +69,7 @@
     </p>
 </form>
 
-${stylesheets.add('<link rel="stylesheet" href="${urls.base}/edit/forms/css/customForm.css" />',
-                  '<link rel="stylesheet" href="${urls.base}/edit/forms/css/personHasEducationalTraining.css" />')}
+${stylesheets.add('<link rel="stylesheet" href="${urls.base}/templates/freemarker/edit/forms/css/customForm.css" />')}
 
 ${scripts.add('<script type="text/javascript" src="${urls.base}/js/utils.js"></script>',
               '<script type="text/javascript" src="${urls.base}/js/customFormUtils.js"></script>')}
\ No newline at end of file