How to use customFieldPicker to get its selected value

Hi everyone,

I am new to Appian and facing challenges in using customFieldPicker, we need to implement:

Do we have any Field where user can search for exiting list of values from database, and if value(text column in our case) is not there in the list then whatever value user has typed in can be written to DB on the form submission. Later the value will become part of the list.

We implemented it like this:

We have one table having 2 fields- id and text only. The ER we created is attached below:

We are unable to save the value. Please let me know what I am doing wrong.

Thank you!

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