diff --git a/webapp/src/edu/cornell/mannlib/vitro/webapp/ontology/update/ABoxUpdater.java b/webapp/src/edu/cornell/mannlib/vitro/webapp/ontology/update/ABoxUpdater.java
index d994e3c9a..505df5d9d 100644
--- a/webapp/src/edu/cornell/mannlib/vitro/webapp/ontology/update/ABoxUpdater.java
+++ b/webapp/src/edu/cornell/mannlib/vitro/webapp/ontology/update/ABoxUpdater.java
@@ -403,9 +403,6 @@ public class ABoxUpdater {
 		//  if the newly added property has an inverse in the new TBox, then for all  existing
 		//  ABox statements involving that inverse (if the inverse is new also there won't be
 		//  any) add the corresponding statement with the new property.
-		//  
-		//  Shouldn't a reasoner be doing this?
-		
 		
 		OntProperty inverseOfAddedProperty = addedProperty.getInverseOf();
 		
@@ -419,8 +416,17 @@ public class ABoxUpdater {
 				while (iter.hasNext()) {
 					
 					Statement stmt = iter.next();
-					Statement newStmt = ResourceFactory.createStatement(stmt.getObject().asResource(), addedProperty, stmt.getSubject());
-					additions.add(newStmt);
+					
+					if (stmt.getObject().isResource()) {
+					   Statement newStmt = ResourceFactory.createStatement(stmt.getObject().asResource(), addedProperty, stmt.getSubject());
+					   additions.add(newStmt);
+					} else {
+						logger.log("WARNING: expected the object of this statement to be a Resource, and it's not. No inverse has been asserted: " + 
+							            " subject = " + stmt.getSubject().getURI() +
+										" property = " + stmt.getPredicate().getURI() +
+						                " object = " + (stmt.getObject().isLiteral() ?  ((Literal)stmt.getObject()).getLexicalForm()
+						                		                                          : ((Resource)stmt.getObject()).getURI()));
+					}
 				}
 				
 				aboxModel.add(additions);
@@ -474,18 +480,22 @@ public class ABoxUpdater {
 		}
 		
 		OntProperty replacementProperty = null;
-		OntProperty parent =  deletedProperty.getSuperProperty();
 		
-		if (parent != null) {
-			replacementProperty = newTboxModel.getOntProperty(parent.getURI());
+		if (!propObj.getNotes().equals("Delete")) {
+		
+			OntProperty parent =  deletedProperty.getSuperProperty();
 			
-			while (replacementProperty == null) {
-				 parent = parent.getSuperProperty();
-				 if (parent == null) {
-					 break;
-				 }
-		    	 replacementProperty = newTboxModel.getOntProperty(parent.getURI()); 			
-			} 
+			if (parent != null) {
+				replacementProperty = newTboxModel.getOntProperty(parent.getURI());
+				
+				while (replacementProperty == null) {
+					 parent = parent.getSuperProperty();
+					 if (parent == null) {
+						 break;
+					 }
+			    	 replacementProperty = newTboxModel.getOntProperty(parent.getURI()); 			
+				} 
+			}
 		}
 		
 		Model deletePropModel = ModelFactory.createDefaultModel();
@@ -574,6 +584,13 @@ public class ABoxUpdater {
                 		                                          : ((Resource)statement.getObject()).getURI()));	
 	}
 
+    public static String stmtString(Statement statement) {
+    	return  " subject = " + statement.getSubject().getURI() +
+    			" property = " + statement.getPredicate().getURI() +
+                " object = " + (statement.getObject().isLiteral() ? ((Literal)statement.getObject()).getLexicalForm() + " (Literal)"
+                		                                          : ((Resource)statement.getObject()).getURI() + " (Resource)");	
+    }    
+	
 	/**
 	 * 
 	 * Update a knowledge base to account for a class deletion in the ontology.
diff --git a/webapp/src/edu/cornell/mannlib/vitro/webapp/ontology/update/DateTimeMigration.java b/webapp/src/edu/cornell/mannlib/vitro/webapp/ontology/update/DateTimeMigration.java
index a2a2c5bf8..438ee5fdf 100644
--- a/webapp/src/edu/cornell/mannlib/vitro/webapp/ontology/update/DateTimeMigration.java
+++ b/webapp/src/edu/cornell/mannlib/vitro/webapp/ontology/update/DateTimeMigration.java
@@ -149,38 +149,39 @@ public class DateTimeMigration {
 		       } else  if (yPrecisionURI.equals(precision)) {
 		    	   try {
 		               date = yearFormat.parse(stmt.getObject().asLiteral().getLexicalForm());
+		               newStmt = ResourceFactory.createStatement(stmt.getSubject(), stmt.getPredicate(), getDateTimeLiteral(date) );
 		    	   } catch (ParseException pe) {
-		    		   logger.log("Parse Exception for year literal: " + stmt.getObject().asLiteral().getLexicalForm() + ". skipping statement.");
-		    	   }
-		    	   
-		    	   newStmt = ResourceFactory.createStatement(stmt.getSubject(), stmt.getPredicate(), getDateTimeLiteral(date) );
-		    	   
+		    		   logger.log("Parse Exception for year literal: " + stmt.getObject().asLiteral().getLexicalForm() + 
+		    				   ". The following statement has been removed from the knowledge base " + stmtString(stmt));
+		    	   }		    	   		    	   
 		       } else  if (ymPrecisionURI.equals(precision)) {
 		    	   try {
 		               date = yearMonthFormat.parse(stmt.getObject().asLiteral().getLexicalForm());
+		               newStmt = ResourceFactory.createStatement(stmt.getSubject(), stmt.getPredicate(), getDateTimeLiteral(date) );
 		    	   } catch (ParseException pe) {
-		    		   logger.log("Parse Exception for year literal: " + stmt.getObject().asLiteral().getLexicalForm() + ". skipping statement.");
+		    		   logger.log("Parse Exception for yearMonth literal: " + stmt.getObject().asLiteral().getLexicalForm() + 
+		    				   ". The following statement has been removed from the knowledge base " + stmtString(stmt));
 		    	   }
-		    	   
-		    	   newStmt = ResourceFactory.createStatement(stmt.getSubject(), stmt.getPredicate(), getDateTimeLiteral(date) );
 		       } else  if (ymdPrecisionURI.equals(precision)) {
 		    	   try {
 		               date = yearMonthDayFormat.parse(stmt.getObject().asLiteral().getLexicalForm());
+		               newStmt = ResourceFactory.createStatement(stmt.getSubject(), stmt.getPredicate(), getDateTimeLiteral(date) );
 		    	   } catch (ParseException pe) {
-		    		   logger.log("Parse Exception for year literal: " + stmt.getObject().asLiteral().getLexicalForm() + ". skipping statement.");
-		    	   }
-		    	   
-		    	   newStmt = ResourceFactory.createStatement(stmt.getSubject(), stmt.getPredicate(), getDateTimeLiteral(date) );
-	   
+		    		   logger.log("Parse Exception for yearMonthDay literal: " + stmt.getObject().asLiteral().getLexicalForm() + 
+		    				   ". The following statement has been removed from the knowledge base " + stmtString(stmt));
+		    	   }	   
 		       } else  if (ymdtPrecisionURI.equals(precision)) {
-		    	   logger.log("WARNING: unhandled precision found for individual " + stmt.getSubject().getURI() + ": " + precision );
+		    	   logger.log("WARNING: unhandled precision found for individual " + stmt.getSubject().getURI() + ": " + precision +
+		    			      ". The following statement has been removed from the knowledge base " + stmtString(stmt));
 		       } else {
-		    	   logger.log("WARNING: unrecognized precision found for individual " + stmt.getSubject().getURI() + ": " + precision );
+		    	   logger.log("WARNING: unrecognized precision found for individual " + stmt.getSubject().getURI() + ": " + precision +
+		    			      ". The following statement has been removed from the knowledge base " + stmtString(stmt));
 		       }
-			   
+
+			   retractions.add(stmt);
+			     
 		       if (newStmt != null ) {
 			     additions.add(newStmt);
-			     retractions.add(stmt);
 		       }		   
 		    }
 		   
@@ -217,7 +218,6 @@ public class DateTimeMigration {
 		}	
 	}	
 
-     
     public static Literal getDateTimeLiteral(Date date) {
 
       // Note this loses time zone info, don't know how get parser to extract that
@@ -226,7 +226,13 @@ public class DateTimeMigration {
       Calendar cal = Calendar.getInstance();
       cal.setTime(date);
       XSDDateTime dt = new XSDDateTime(cal);
-      return ResourceFactory.createTypedLiteral(dt);
-        
+      return ResourceFactory.createTypedLiteral(dt);   
     }
+    
+    public static String stmtString(Statement statement) {
+        return  " subject = " + statement.getSubject().getURI() +
+        			" property = " + statement.getPredicate().getURI() +
+                    " object = " + (statement.getObject().isLiteral() ? ((Literal)statement.getObject()).getLexicalForm() + " (Literal)"
+                    		                                          : ((Resource)statement.getObject()).getURI() + " (Resource)");	
+    }    
 }
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