fixed [ 1745790 ] Error when try copy commission

http://sourceforge.net/tracker/index.php?func=detail&aid=1745790&group_id=176962&atid=879332

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

@@ -131,7 +131,6 @@ public class MCommission extends X_C_Commission
 			MCommissionLine line = new MCommissionLine (getCtx(), 0, get_TrxName());
 			PO.copyValues(fromLines[i], line, getAD_Client_ID(), getAD_Org_ID());
 			line.setC_Commission_ID (getC_Commission_ID());
-			line.setC_CommissionLine_ID (0);	//	new
 			if (line.save())
 				count++;
 		}