diff --git a/auditlog/src/main/java/org/genesys/blocks/auditlog/component/AuditTrailInterceptor.java b/auditlog/src/main/java/org/genesys/blocks/auditlog/component/AuditTrailInterceptor.java
index 2aff62a9ca533521f740cc71978f581edff622da..7d1e096b9a2b71478bcb2a954d12361d8abde5e1 100644
--- a/auditlog/src/main/java/org/genesys/blocks/auditlog/component/AuditTrailInterceptor.java
+++ b/auditlog/src/main/java/org/genesys/blocks/auditlog/component/AuditTrailInterceptor.java
@@ -786,7 +786,7 @@ public class AuditTrailInterceptor extends EmptyInterceptor implements Initializ
 	@Override
 	public Boolean isTransient(final Object entity) {
 		if (entity instanceof BasicModel) {
-			return !((BasicModel) entity).isPersisted();
+			return ((BasicModel) entity).isNew();
 		}
 		// TODO Use Spring field access methods?
 		try {
diff --git a/auditlog/src/test/java/org/genesys/blocks/auditlog/service/AuditTrailServiceTest.java b/auditlog/src/test/java/org/genesys/blocks/auditlog/service/AuditTrailServiceTest.java
index 30e8b6ef2f8693a9c300821d2335f698c3a0fdbc..a66682f9d3872b6a3226a0c27e57557cf65acdd0 100644
--- a/auditlog/src/test/java/org/genesys/blocks/auditlog/service/AuditTrailServiceTest.java
+++ b/auditlog/src/test/java/org/genesys/blocks/auditlog/service/AuditTrailServiceTest.java
@@ -122,7 +122,7 @@ public class AuditTrailServiceTest extends ServiceTest {
 	public void testTransactionalListQuery() {
 		ExampleAuditedEntity entity = exampleAuditedEntityService.testList();
 		assertThat(entity.getId(), not(nullValue()));
-		assertThat(entity.isPersisted(), is(true));
+		assertThat(entity.isNew(), is(false));
 		assertThat(listAuditLogs(entity), hasSize(1));
 
 		entity = exampleAuditedEntityService.get(entity.getId());
@@ -140,7 +140,7 @@ public class AuditTrailServiceTest extends ServiceTest {
 	public void testDelete() {
 		ExampleAuditedEntity entity = exampleAuditedEntityService.testList();
 		assertThat(entity.getId(), not(nullValue()));
-		assertThat(entity.isPersisted(), is(true));
+		assertThat(entity.isNew(), is(false));
 		assertThat(entity.getName(), is("Test 3"));
 		assertThat(listAuditLogs(entity), hasSize(1));
 
diff --git a/core/src/main/java/org/genesys/blocks/model/BasicModel.java b/core/src/main/java/org/genesys/blocks/model/BasicModel.java
index 3193015bccc084cd041a17fbd13ac8d384863587..82659eddf247aa22ddb02efe3e0448db821e1baf 100644
--- a/core/src/main/java/org/genesys/blocks/model/BasicModel.java
+++ b/core/src/main/java/org/genesys/blocks/model/BasicModel.java
@@ -22,6 +22,8 @@ import javax.persistence.Id;
 import javax.persistence.MappedSuperclass;
 import javax.persistence.Transient;
 
+import org.springframework.data.domain.Persistable;
+
 import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.annotation.JsonView;
 
@@ -29,7 +31,7 @@ import com.fasterxml.jackson.annotation.JsonView;
  * The Class BasicModel.
  */
 @MappedSuperclass
-public class BasicModel extends EmptyModel {
+public class BasicModel extends EmptyModel implements Persistable<Long> {
 
 	/** The Constant serialVersionUID. */
 	private static final long serialVersionUID = 2709998920148999956L;
@@ -39,7 +41,7 @@ public class BasicModel extends EmptyModel {
 	@Id
 	@GeneratedValue(strategy = GenerationType.AUTO)
 	@Column(name = "id", unique = true, nullable = false)
-	private Long id = InMemoryIdGenerator.nextId();
+	private Long id = null; // InMemoryIdGenerator.nextId();
 
 	/*
 	 * (non-Javadoc)
@@ -68,8 +70,8 @@ public class BasicModel extends EmptyModel {
 	 */
 	@JsonIgnore
 	@Transient
-	public final boolean isPersisted() {
-		return (id != null) && (id.longValue() > 0);
+	public final boolean isNew() {
+		return (id == null) || (id.longValue() < 0);
 	}
 
 	/*
@@ -100,10 +102,8 @@ public class BasicModel extends EmptyModel {
 			return false;
 		}
 		final BasicModel other = (BasicModel) obj;
-		if (id == null) {
-			if (other.id != null) {
-				return false;
-			}
+		if (id == null || other.id == null) {
+			return false;
 		} else if (!id.equals(other.id)) {
 			return false;
 		}
diff --git a/core/src/main/java/org/genesys/blocks/model/VersionedModel.java b/core/src/main/java/org/genesys/blocks/model/VersionedModel.java
index 64c184048ee1d3b9eead898b83549adf554932ee..aa9ebefa24f68bf81b8752723554c59c8d481383 100644
--- a/core/src/main/java/org/genesys/blocks/model/VersionedModel.java
+++ b/core/src/main/java/org/genesys/blocks/model/VersionedModel.java
@@ -103,8 +103,9 @@ public abstract class VersionedModel extends BasicModel implements Activatable {
 		if (getClass() != obj.getClass())
 			return false;
 		VersionedModel other = (VersionedModel) obj;
-		if (active != other.active)
-			return false;
+		// We're only interested in id+version combination
+		// if (active != other.active)
+		// 	return false;
 		if (version == null) {
 			if (other.version != null)
 				return false;
diff --git a/core/src/test/java/org/genesys/blocks/tests/model/UuidModelTest.java b/core/src/test/java/org/genesys/blocks/tests/model/UuidModelTest.java
index 1fd8c6d099ca1d65a3db12abd929d2ddac57e43e..48f3b649264e245d30a081bb5d874732903e6d87 100644
--- a/core/src/test/java/org/genesys/blocks/tests/model/UuidModelTest.java
+++ b/core/src/test/java/org/genesys/blocks/tests/model/UuidModelTest.java
@@ -41,7 +41,7 @@ public class UuidModelTest extends ServiceTest {
 	@Test
 	public void testConstructor() {
 		UuidEntity entity = new UuidEntity();
-		assertThat(entity.getId(), not(nullValue()));
+		assertThat(entity.getId(), nullValue());
 		assertThat(entity.getUuid(), is(nullValue()));
 		assertThat(entity.getVersion(), nullValue());
 	}
diff --git a/core/src/test/java/org/genesys/blocks/tests/model/VersionedModelTest.java b/core/src/test/java/org/genesys/blocks/tests/model/VersionedModelTest.java
index 06d14c320abf7d966e30a8b263c575fdfac821b5..81c9a571befcf81dd7349471da4b7b461e5f08b1 100644
--- a/core/src/test/java/org/genesys/blocks/tests/model/VersionedModelTest.java
+++ b/core/src/test/java/org/genesys/blocks/tests/model/VersionedModelTest.java
@@ -39,7 +39,7 @@ public class VersionedModelTest extends ServiceTest {
 	@Test
 	public void testConstructor() {
 		VersionedEntity entity = new VersionedEntity();
-		assertThat(entity.getId(), not(nullValue()));
+		assertThat(entity.getId(), nullValue());
 		assertThat(entity.getVersion(), nullValue());
 		assertThat(entity.isActive(), is(true));
 	}
diff --git a/security/src/main/java/org/genesys/blocks/security/service/impl/CustomAclServiceImpl.java b/security/src/main/java/org/genesys/blocks/security/service/impl/CustomAclServiceImpl.java
index cf5bb54d019c9dc030cc42d338fe276cb8459fa7..58c55351e3e79e9b5ea68464677fe1b0f1e693b9 100644
--- a/security/src/main/java/org/genesys/blocks/security/service/impl/CustomAclServiceImpl.java
+++ b/security/src/main/java/org/genesys/blocks/security/service/impl/CustomAclServiceImpl.java
@@ -168,7 +168,7 @@ public class CustomAclServiceImpl implements CustomAclService {
 			final AclSid ownerSid = SecurityContextUtil.getCurrentUser();
 			if (ownerSid == null) {
 				LOG.warn("No SID in security context, not assigning creator permissions");
-			} else if (!ownerSid.isPersisted()) {
+			} else if (ownerSid.isNew()) {
 				LOG.warn("Owner SID not persisted, not assigning creator permissions");
 			} else {
 				objectIdentity.setOwnerSid(ownerSid);
@@ -202,7 +202,7 @@ public class CustomAclServiceImpl implements CustomAclService {
 
 			if (objectIdentity.getOwnerSid() == null) {
 				final AclSid ownerSid = SecurityContextUtil.getCurrentUser();
-				if (ownerSid != null && ownerSid.isPersisted()) {
+				if (ownerSid != null && ! ownerSid.isNew()) {
 					objectIdentity.setOwnerSid(ownerSid);
 					
 					// Grant permissions to owner