Errors when updating Element Entry with HDL

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Hello,

I had a question regarding the hdl.

I am trying to learn how to update an Element Entry for a person. Say for example Joe has a dental plan that started on 10/01/2019, and 10 dollars gets taken out each month for this. I wish to simply change that screen amount from 10 bucks to 15. That's it. There shouldn't be a new record created, just grab the record that's there, and update the amount. I've hit a number of dead ends trying to figure this out, and was curious if people had feedback about anything I might be doing wrong here.