When I generate a Bill of Material some of the quantity's are not integers (ex. 1.473 52e 006). This is problem generally occurs with the larger quantity's.
If you're still looking for something, maybe check the "BOM quantity" under your part's/assembly's File Properties(summary information)-> Custom/Configuration Specific tabs:
I usually just leave it as "- None -" so that SW will automatically figure it out.
Retrieving data ...