How to exclude the dropdown option after it was used?

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There is a list of e.g. products, where I can create a new product, and fill in some details about it. The list is editable, so for each item, it shows editable input and dropdown fields.  The challenge is – afterI selected a product from the dropdown, it should be excluded from the available dropdown options when I create a new list item. How can it be done if product is an enumerator? How can it be done if product is a reference-selector?
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