Hi Tihomir,
</br>
Thanks a lot for your help. I have tried the Designer 2.3.0.Final and Guvnor's Validate Process passed!
</br>
However I am facing a new problem:  Although I can see the Service Tasks icons in the palette (see attached picture), the icons are not displayed anymore in the business process diagram, and a FileNotFoundException is thrown every time I try to place one of these Service Tasks into the canvas. Please see the exception and tell me whether I missed something in the installation/replacement of the Designer.
</br></br>
<img src="http://drools.46999.n3.nabble.com/file/n4018937/IconsNotDisplayed.png" border="0" alt="BPMN2 Process doesn't show icons"/>
<a href="http://drools.46999.n3.nabble.com/file/n4018937/iconsException.txt" target="_top" rel="nofollow" link="external">iconsException.txt</a>

	
	
	
<br/><hr align="left" width="300" />
View this message in context: <a href="http://drools.46999.n3.nabble.com/Guvnor-reports-Invalid-Gateway-direction-for-Parallel-Gateway-tp4018934p4018937.html">Re: [rules-users] Guvnor reports Invalid Gateway direction for Parallel Gateway.</a><br/>
Sent from the <a href="http://drools.46999.n3.nabble.com/Drools-User-forum-f47000.html">Drools: User forum mailing list archive</a> at Nabble.com.<br/>