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In the Invoke activity property dialogue, you have two options to Browse for possible Input and Output variables (respectively) for the selected Operation. Selecting a VALID input variable, for example, in the Input Variable Chooser, enables the OK button. However, hitting OK does not populate the Input Variable on the Invoke Property Editor. See attached screenshot and sample project.
Created attachment 37427 [details] Alaska screenshot with annotations
Created attachment 37428 [details] Alaska / NetBeans project test case
The BPEL file in the referenced project contains an ns3 prefix for the namespace, which is shared by 3 WSDL files. There is ambiguities of various definitions there. It's quite difficult to provide correct work of the dialog with an invalid source data. So I suggest to treat this defect as a duplicate of the Issue #86958. See also the issue #92660. I can provide more detailed result of analysis by request. *** This issue has been marked as a duplicate of 86958 ***