diff --git a/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/component/NumberBox.java b/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/component/NumberBox.java
index 269f59d9e5..9d407ad7a8 100644
--- a/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/component/NumberBox.java
+++ b/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/component/NumberBox.java
@@ -466,7 +466,7 @@ public class NumberBox extends Div
 	 */
 	public boolean isEnabled()
 	{
-		 return decimalBox.isReadonly();
+		 return !decimalBox.isReadonly();
 	}
 	
 	@Override