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a!update with list of dictionary

Certified Lead Developer

According to docs: a!update() Function - Appian 21.4, this function should work with a list, map, dictionary, cdt or record.  I'm having difficulty with one particular case of a!update with a list of dictionary (version 21.4).

I have the following snippet of code and am receiving the following error:

This error message is unable to be duplicated with a simple index, meaning the error message is somewhat misleading to myself:

Are there any known workarounds - or does this seem like a product issue?  I would rather not have to check if my data type is a list of dictionary prior to calling the a!update function.

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