Vantage
This is working as designed:
The JCL Model list window does not support zooming objects.
It can work with "zoomed objects" only if the object returns some records even without zooming into the object.
This is not the case of DTOC4POL. This object doesn't make sense without zooming into it and so returns no data.
However, there is a simple circumvention for filter zooms by using the destination object and setting a proper filter.
For the customer case it will be the DTOC4SYS object and setting a filter for the requested storage group.