Using the new a!update()

Question

Is is possible to update multiple fields of a CDT using the a!update()? The documentation shows that you can for a regular array, but with the CDT examples shown, it only updates one field at a time. When I test it out in an expression, it throws an error. I just want to check that I'm not missing anything here. 
 e.g. a!update(
 data: ri!submission,
 index: {"StatusID", "SubmissionTypeID"},
 value: {1, 2}
) 
 error thrown: Expression evaluation error at function a!update: Invalid index: cannot index multiple indices of type List of Text String into type CRA_T_Submission

Mike Schmitt · Answer

I have reported this to Appian recently, because I found the same issue with testing. It throws the same error when you try with either a Dictionary or with a CDT (surprisingly), but works if you feed it a MAP specifically. Which is weird. I was really looking forward to replacing the "update dictionary" plug-in, but as it stands, a!update() is not usable for that in 99% of my current use cases. 
 Working (a!map): 
 Not working (dictionary): 
 
 Edit to add in retrospect: as of 21.4, the nonworking cases I mentioned earlier now seem to work.

alex.ladue · Answer

This is a known bug with updating dictionaries and CDTs with a!update(). This will work as expected for maps and record data types. We are working to fix the issue, but I don't have a timeline for the fix right now.

Using the new a!update()

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