Agile Central - App SDK: Collections 'Summary' function seems not to work with custom fields

Document ID : KB000126464
Last Modified Date : 11/02/2019
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We are using the SDK's collection 'summary' fetch option. It works fine for all standard fields. Yet, when we include a custom field then we are getting a 500 error. Here is our code:
.. ... 

model: 'userstory',


When above code runs with any standard fields (such as Priority in the above snippet) then all works. Yet, when we add this custom field (in above code snippet is: 'c_myCustomField') then we receive: 

POST 500 
Indeed your experience is correct.

Custom Fields do not take part in the SDK's wsapi store Summary argument of the fetch function.