From 731ae053a882ae45838cdf364eec6c301c341b2d Mon Sep 17 00:00:00 2001
From: Heng Sin Low <hengsin@gmail.com>
Date: Wed, 13 Sep 2017 16:35:03 +0800
Subject: [PATCH] IDEMPIERE-3485 Report/Process: Unique constraint exception
 after save parameter

---
 .../src/org/compiere/model/MPInstancePara.java    | 15 +++++++++++++++
 .../webui/apps/ProcessParameterPanel.java         |  2 +-
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/org.adempiere.base/src/org/compiere/model/MPInstancePara.java b/org.adempiere.base/src/org/compiere/model/MPInstancePara.java
index 2510e73c8a..08f3b1199b 100644
--- a/org.adempiere.base/src/org/compiere/model/MPInstancePara.java
+++ b/org.adempiere.base/src/org/compiere/model/MPInstancePara.java
@@ -232,4 +232,19 @@ public class MPInstancePara extends X_AD_PInstance_Para
 		}
 		return -1;
 	}
+	
+	/**
+	 * Get existing AD_PInstance_Para record or create a new one if not found
+	 * @param ctx
+	 * @param AD_PInstance_ID
+	 * @param SeqNo
+	 */
+	public static MPInstancePara getOrCreate(Properties ctx, int AD_PInstance_ID, int SeqNo)
+	{
+		Query query = new Query(ctx, Table_Name, "AD_PInstance_ID=? AND SeqNo=?", null);
+		MPInstancePara para = query.setParameters(AD_PInstance_ID, SeqNo).first();
+		if (para == null)
+			para = new MPInstancePara(ctx, AD_PInstance_ID, SeqNo);
+		return para;
+	}
 }	//	MPInstance_Para
diff --git a/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/apps/ProcessParameterPanel.java b/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/apps/ProcessParameterPanel.java
index a12dfaa695..f5da8c2809 100644
--- a/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/apps/ProcessParameterPanel.java
+++ b/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/apps/ProcessParameterPanel.java
@@ -520,7 +520,7 @@ public class ProcessParameterPanel extends Panel implements
 				result2 = editor2.getValue();
 
 			// Create Parameter
-			MPInstancePara para = new MPInstancePara(Env.getCtx(),
+			MPInstancePara para = MPInstancePara.getOrCreate(Env.getCtx(),
 					m_processInfo.getAD_PInstance_ID(), i);
 			GridField mField = (GridField) m_mFields.get(i);
 			para.setParameterName(mField.getColumnName());