Fix [2790959] Document Date not updating Period as it did in Compiere (commit 1 of 2)

Link to SF Tracker: http://sourceforge.net/support/tracker.php?aid=2790959

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

@@ -200,6 +200,29 @@ public class CalloutEngine implements Callout
 		return m_mTab != null ? m_mTab.getActiveCallouts().length > 1 : false;
 	}	//	isCalloutActive
 
+	/**
+	 * 	Is the current callout being called in the middle of 
+     *  another callout doing her works.
+     *  Callout can use GridTab.getActiveCalloutInstance() method
+     *  to find out callout for which field is running.
+	 *	@return true if active
+	 */
+	protected boolean isThisCalloutActive()
+	{
+		if (m_mTab == null)
+			return false;
+		//greater than 1 instead of 0 to discount this callout instance
+		String className = this.getClass().getName();
+		String methodName = Thread.currentThread().getStackTrace()[2].getMethodName();
+		String calloutName = className + "." + methodName;
+		int cnt = 0;
+		for (String activeCallouts : m_mTab.getActiveCallouts()) {
+			if (activeCallouts.equals(calloutName))
+				cnt++;
+		}
+		return cnt > 1;
+	}	//	isCalloutActive
+
 	/**
 	 * 	Set Callout (in)active.
      *  Depreciated as the implementation is not thread safe and

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

@@ -49,7 +49,7 @@ public class CalloutGLJournal extends CalloutEngine
 	public String period (Properties ctx, int WindowNo, GridTab mTab, GridField mField, Object value)
 	{
 		String colName = mField.getColumnName();
-		if (value == null || isCalloutActive())
+		if (value == null || isThisCalloutActive())
 			return "";
 
 		int AD_Client_ID = Env.getContextAsInt(ctx, WindowNo, "AD_Client_ID");