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WaterGems VSD Pumps in Parralel and error message 41797

I am using Watergems V8i series 3, and trying to model a pump station with two identical VSD pumps in parallel. When I set the pumps up in parrallel, i.e. by just making them have a common node on either side of the pumps, the system balances but only uses one pump. I have used identical controls for the identical pumps and they are both running of the same control node. I was after some pointers on how to properly set up pumps in parrallel?

Note, i realise that as they are identical pumps I could just make them one pump and double the flow but I am hoping to model surge using HAMMER later on with this model and there would be implications for this. (I have done this and the system worked)

Also, when I run the model I get error message 41797 that states "variable speed pumping is not supported by EPANET; results may not match EPANET" and was wondering what this means? The model i am working on was converted to gems from an existing EPANET Model and i think this may just be a hangover warning to state that i may get different results when using EPANET. the model still appears to run and balance even though this warning shows up.

Thanks all,

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