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That error is no longer there but it still changes the ACL even with the code implemented. 
Would changing any of these help?
Did these screen shots help at all?
Do you have an update here yet?
Hello Ellen!
Not yet, sorry... I'll ping dev team.
Hi Ellen -
What JS code do you have placed for you ACL parameter?
Return undefined;
Try use: return "";
or
return null;
When I used return ""; the update service wouldn't even work right. I then tried return null; and with that code, there is nothing in the ACL field instead of the right value for the user who created it.
Hi Ellen,
pre
return undefined;
/pre
Is correct code..
Could you please try to add new one datasource, and give it name "testDatasource".
Then use that code for "acl" field.
And then invoke this service on the page load.
After, please take a look at the console network tab to see actual request.
Regards.
The add button when I try to add a new service doesn't work. I've tried Safari and Chrome and when I try to add a new service it doesn't do anything at all.