From 70d1df6b35ed1a1a438cbfc1b030faeb2c0a29df Mon Sep 17 00:00:00 2001
From: Carlos Ruiz <carg67@gmail.com>
Date: Sat, 6 Aug 2016 22:10:45 +0200
Subject: [PATCH] IDEMPIERE-2678 Allow to set explicit NULL value for fields

---
 org.adempiere.base/src/org/compiere/model/GridField.java | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/org.adempiere.base/src/org/compiere/model/GridField.java b/org.adempiere.base/src/org/compiere/model/GridField.java
index cc1fb87121..237771dcaf 100644
--- a/org.adempiere.base/src/org/compiere/model/GridField.java
+++ b/org.adempiere.base/src/org/compiere/model/GridField.java
@@ -605,6 +605,10 @@ public class GridField
 	public Object getDefault(ParseSeq seqGetDefaultValue){
 		Object defaultValue = null;
 		for (Character seqType : seqGetDefaultValue){
+			if (   seqType == '3'  // default from Expression 
+				&& m_vo.DefaultValue != null
+				&& m_vo.DefaultValue.toUpperCase().equals("NULL")) // IDEMPIERE-2678
+				return null;
 			defaultValue = getDefaultValueByType(seqType);
 			if (defaultValue != null)
 				return defaultValue;