Struggling to set attribute values and units in part usages

[DuncanWilliamGibbons]

Hi there,

Im having trouble figuring out how to set attribute values in part usages. I've tried different approaches and each approach sets the value but throws an error for the units. Any suggestions?

part def Arm{
attribute length : ISQBase::LengthValue;
attribute g : ISQSpaceTime::AccelerationValue;
}

part arm:Arm{
:>> length = 50 [cm];
:>> g = 9.81 [m*s^-2];
}

I've also tried variants such as:

attribute redefines length = 50[ISQBase::LengthUnit::m];
attribute redefines length = 50[ISQBase::m];

Error:

Unable to resolve name 'cm' for reference 'memberElement' on element

[DuncanWilliamGibbons]

Turns out I had imported the SI unit library in the wrong package.