Here are my notes on DxD cross probing; hopefully this applies to Expedition:
DxD – Cross probing with PADS Layout
Cross probing is enabled by default in DxD. If not, select <Setup>and check the box next to ‘Cross Probing’. You can select what gets probed in <Setup><Settings>’Cross Probing’.
Cross Probing needs to be enabled in Layout. Select <Tools><DxDesigner>. Select the DxD project in Cross Probing and then press ‘Connect’.
Cross probing between an Expedition schematic and PADS is not supported, how have you managed to set up such a project?