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Currently a port loaded into CASA from compapp wsdl files can only be "deleted" not "unloaded". The delete action physically removes the port from the wsdl file. The user has to manually recreate the port again later to reuse the port. The unload action will keep the port around for later use.
I suggest that pressing the delete key on the loaded port should either 1) perform an unload by default or 2) prompt the user to decide whether they want to unload the port or delete the port. I prefer option 1 since I don't know why you would want to modify a WSDL that is potentially no longer used from the CASA editor.