Units is only supported in Format to string, not in scan from string...
From the link:
{Unit} (optional)
Overrides the original unit of a VI when you use a function to convert a physical quantity (a value with an associated unit). You must use a compatible unit. You can use this syntax element only with the Format Into String function.
Oh its even worse than that. Now that I have data in a CSV using SI the comma screws things up as well. Now I can't scan "10M, -3.1" even though I use the same format string for conversion and scanning. SI makes text very human friendly to read but now I have to build a special function to parse it? Sheese. What a PITA.
