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We have investigated the issue and we had it the wrong way around. The way to solve the error is to comment out Integ_e, so that it does [u]not[/u] initialize to 0.
I hope that this helps :)
Hi, arspr and Natalia,
The fix to your issue is relatively straightforward.
In MSL, within wwtp.main.msl > wwtp.base.controllers.msl > wwtp.base.controllers.pi_saturation.msl and wwtp.base.controllers.pid_saturation.msl
under 'initial', you will find the term 'state.Integ_e = 0.0 ;'
If you comment out or delete this line, there will no longer be an unexpected transient at the beginning of the Dynamic run.