Fixed big issues with the new trx management

BF [1920179] - VPayment completing documents outside of Trx
https://sourceforge.net/tracker/?func=detail&atid=879332&aid=1920179&group_id=176962
PO is marking the key as null on VPayment

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

@@ -1885,7 +1885,7 @@ public abstract class PO
 		//
 		for (int i = 0; i < m_IDs.length; i++)
 		{
-			if (m_IDs[i].equals(I_ZERO))
+			if (m_IDs[i].equals(I_ZERO) || m_IDs[i] == Null.NULL)
 				continue;
 			return false;	//	one value is non-zero
 		}