HP BladeSystem Interconnect - HP Virtual Connect Flex-10 Module: Internal Stacking Link X7 or X8 Will Be Disabled when You Insert a SFP+ Module

HP BladeSystem Interconnect - HP Virtual Connect Flex-10 Module: Internal Stacking Link X7 or X8 Will Be Disabled when You Insert a SFP+ Module


Information
Port X7 and port X8 is internally cross linked to an adjacent HP Virtual Connect Flex-10 module. This connection is used a Stacking link (Virtual Connect Flex-10 bay 1, port X7 - Virtual Connect Flex-10 bay 2, port X7 and Virtual Connect Flex-10 bay 1, port X8 - Virtual Connect Flex-10 bay 2, port X8 ) between the Virtual Connect Flex-10 interconnects.
Port X7 and port X8 can also be used to connect to an external network switch. The moment an external SFP+ module is inserted in port X7 or port X8 , the internal stacking link (Virtual Connect Flex-10 bay 1, port X7 - Virtual Connect Flex-10 bay 2, port X7 , or Virtual Connect Flex-10 bay 1, port X8 - Virtual Connect Flex-10 bay 2, port X8 ) is disabled and not visible anymore as Stacking link within Virtual Connect Manager (VCM)
Details

This is working as designed.
Source:  http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&taskId=120&prodSeriesId=3794423&prodTypeId=329290&objectID=c01677930