BF [ 1693997 ] Calculation of cost should happen when transaction complete (fix for MatchPO to Invoice)

base/src/org/compiere/model/MMatchPO.java

@@ -799,6 +799,8 @@ public class MMatchPO extends X_M_MatchPO
 	
 	// Elaine 2008/6/20	
 	private String createMatchPOCostDetail()
+	{
+		if (getM_InOutLine_ID() != 0)
 		{
 			MOrderLine oLine = getOrderLine();
 			
@@ -885,7 +887,7 @@ public class MMatchPO extends X_M_MatchPO
 						oLine.getDescription(), get_TrxName());
 				// end MZ
 			}
-		
+		}
 		return "";
 	}