If fuel pressure drops under target then error goes to negative value that is correct.
But Under engine protection/minimum pressure error value its not allowed to put negative numbers.
The Minimum Pressure Error setting defines how much the pressure must drop below the target for protection to activate.
This means it is effectively a negative value.
I’ve just reviewed the help documentation and noticed the explanation is misleading and needs to be corrected.
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Yes, but for example reasonable cut is not 1kpa drop from target. Its ok to have some drop for most tunes and safety cut depending of car is even -30…-100kpa. So negative values are needed for this limit, but software does not allow to enter values smaller than 1kpa 
If you enter 30 as a min it means 30kpa ubder effective pressure target. it is like negative value.
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