'ActivityAdditionalParams' field missing on Letter and Fax entities

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Posted on by NotMyActualName

Hi,

On one of my records, I have a set of different activities, of the types Email, Fax, Letter, Phonecall and a custom activity type called InternalNote.

I have added the field 'ActivityAdditionalParams' to the view that is used by the subgrid, for testing purposes. This all works fine.

When I try to put some text into the ActivityAdditionalParams field using the Client API, all goes well for the Email, Phonecall and the custom InternalNote records. However, when doing the same thing for Fax and Letter records, I get an error saying "Property activityadditionalparams is not valid for write".

I then checked if I could see the column when editing a form or adding an existing column for the Fax or Letter entities, and it turns out they simply do not have this column available, even though the documentation says they do (see Fax and Letter documentation).

Is this a bug? Or am I missing something?

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Dynamics 365 general

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