diff --git a/org.adempiere.base/src/org/eevolution/process/EnableNativeSequence.java b/org.adempiere.base/src/org/eevolution/process/EnableNativeSequence.java
index b54d713f86..ac5bfd2b8e 100644
--- a/org.adempiere.base/src/org/eevolution/process/EnableNativeSequence.java
+++ b/org.adempiere.base/src/org/eevolution/process/EnableNativeSequence.java
@@ -61,7 +61,7 @@ public class EnableNativeSequence extends SvrProcess
 		boolean SYSTEM_NATIVE_SEQUENCE = MSysConfig.getBooleanValue(MSysConfig.SYSTEM_NATIVE_SEQUENCE,false);
 		if (SYSTEM_NATIVE_SEQUENCE)
 		{
-			throw new AdempiereException("Native Sequence is Actived");
+			throw new AdempiereException("Native Sequence is already set");
 		}
 		
 		// update the sysconfig key to Y out of trx and reset the cache
diff --git a/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/ValuePreference.java b/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/ValuePreference.java
index b0572ad4fb..d6a7cc9d4e 100644
--- a/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/ValuePreference.java
+++ b/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/ValuePreference.java
@@ -20,6 +20,7 @@ import java.util.Properties;
 import java.util.UUID;
 import java.util.logging.Level;
 
+import org.adempiere.exceptions.AdempiereException;
 import org.adempiere.webui.adwindow.ADWindow;
 import org.adempiere.webui.adwindow.AbstractADWindowContent;
 import org.adempiere.webui.apps.AEnv;
@@ -642,6 +643,8 @@ public class ValuePreference extends Window implements EventListener<Event>
 		int Client_ID = cbClient.isChecked() ? m_AD_Client_ID : 0;
 		int Org_ID = cbOrg.isChecked() ? m_AD_Org_ID : 0;
 		int AD_Preference_ID = DB.getNextID(m_ctx, "AD_Preference", null);
+		if (AD_Preference_ID < 0)
+			throw new AdempiereException("Cannot obtain sequence for AD_Preference");
 		//
 		StringBuilder sql = new StringBuilder ("INSERT INTO AD_Preference ("
 			+ "AD_Preference_ID, AD_Preference_UU, AD_Client_ID, AD_Org_ID, IsActive, Created,CreatedBy,Updated,UpdatedBy,"
diff --git a/org.compiere.db.postgresql.provider/src/org/compiere/db/DB_PostgreSQL.java b/org.compiere.db.postgresql.provider/src/org/compiere/db/DB_PostgreSQL.java
index eb0999152c..30a6c27a0a 100755
--- a/org.compiere.db.postgresql.provider/src/org/compiere/db/DB_PostgreSQL.java
+++ b/org.compiere.db.postgresql.provider/src/org/compiere/db/DB_PostgreSQL.java
@@ -871,7 +871,24 @@ public class DB_PostgreSQL implements AdempiereDatabase
 	}
 
 	public int getNextID(String name, String trxName) {
-		int m_sequence_id = DB.getSQLValueEx(trxName, "SELECT nextval('"+name.toLowerCase()+"')");
+		Trx trx = null;
+		int m_sequence_id = -1;
+		try {
+			// avoid cannot execute nextval() in a read-only transaction
+			if (trxName == null) {
+				trxName = Trx.createTrxName("getNextval");
+				trx = Trx.get(trxName, true);
+			}
+			m_sequence_id = DB.getSQLValueEx(trxName, "SELECT nextval('"+name.toLowerCase()+"')");
+		} catch (Exception e) {
+			if (trx != null) {
+				trx.rollback();
+			}
+		} finally {
+			if (trx != null) {
+				trx.close();
+			}
+		}
 		return m_sequence_id;
 	}