How can I resolve following error?
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It likely means that the value you provided for the Data Store Entity is a variable. However, that input should contain a reference to the entity you want to write to (usually referenced via a constant). Then, you should add an additional input that includes the data that you'd like to write. Take a look at this screenshot for an example: docs.appian.com/.../Write_to_Data_Store_Entity_Smart_Service.html