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The mapper displays the mapping for the currently selected activity from the Design view. The focus is lost after switching to the mapper from the source view. To reproduce: * Close any BPEL process and cloned documents * Open a BPEL process containing an assign activity * Click the assign activity * Click on Mapper * Click on Source * Click back on Mapper - the view is blank To restore this, you need to click on the Design again and then back to Mapper.
Found in Sierra MS5
Such behavior is by design. Will be fixed if we return mapper back to the diagram view.