I am using SP2010 Enterprise on Windows 7 and SPD 2010 & InfoPath 2010 all on the same machine in test. I create an External List based on a ECT and Click on the 'Design Forms in InfoPath' icon and 'Item' which drops down from it. That launches
InfoPath Designer 2010 & downloads the form from
http://<site>/lists/<mylistname>/Item/template.xsn and sets you up in an edit session. I can make changes on the form but when I publish via File | Publish | External List (Publish Form To An External List) I get a save prompt for
local copy & then an error: The following URL is not valid: http://<site>/lists/<mylistname>/Item/template.xsn (same URL as it started with during the
initial download). I took screen shots of the messages to make sure.
Some things I have tried & observations:
If I change to an internal Custom List the publish step (to list not external of course)
works just fine. I also ran this test launching SPD as Administrator with no difference.
I stopped the System Event Notification service per
http://serena-yeoh.blogspot.com/2006/08/infopathformurlnotvalid.html 'net stop sens' with no difference
Any ideas are welcome. BTW I notice that this step of launching the InfoPath designer does change the form on the list in Sharepoint albeit slightly -
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