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Different target head for same control node not allowed

Hi, 

I have three VSPs in parallel and as far as I can tell they follow the criteria outlined in this article for VSPs. 

https://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/38721/modeling-variable-speed-pumps-vsp-s-in-parallel

However, I am still getting the error message. pump definition, VSP type, control node, Target head type, pressure target, relative speed factor and control node on suction are all identical across all three pumps.

Thank you,

Nastassja