To Jerome's point, you're building a custom Analytical Query on top of existing custom CDS view that you already created. While doing so, you did not find the data source for the CDS view you created, is this what you encountered?
Make sure, you mark 'Analytical' option while building your Custom CDS view, only then you will find your custom CDS view in the available data source while creating a query.
In addition, please make a note of these links while creating custom Analytical Queries. Very handy information.
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