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Can a catchment be the outflow element for a catchment?

I have a StormCad model broken up with each catchment material. In this example, I have an area for a roof, a grass lawn, and an urban street. The roof drains to the lawn which drains to the street which drains to a catch basin. For the roof outflow element, it allows me to select the lawn. Is this possible? The calculator seems to error out. Thanks.

Stormcad connect update 2