Inputfields from multiple entities

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Hello all, I want to make a page with input fields from multiple entities  but when I add the input fields of the second entities I get this error: Widget must be read-only because it is connected to an associated attribute. I can make it a reference selector but I want to add new values. How can I do this?
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2 answers
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Are the entities already associated with each other? 
If it is a one-to-one association, the you could add a nested dataview which retrieves the second entity via association. In the nested dataview you can then add the input fields.

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They are associated with a one-to-many. 
But even when I change it to one-to-one I still can't edit the fields. 

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