Level of Detail in Relations

For document line items, I want to display only the item code and name.
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This information can be displayed using ?detail=custom in the following way:

https://demo.flexibee.eu/c/demo/faktura-vydana.xml?relations=polozkyDokladu&detail=custom:kod,polozkyDokladu(nazev)
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For example, for price list item attributes, I want to list only the product ID and typAtributu.
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Unfortunately, this is not possible — ?detail=custom cannot be used with attribute relations. Therefore, if you need values other than those returned by ?detail=summary, you must use ?detail=full.
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