BOM import error: Unable to turn off auto lead days calculation for circular BOM check

This error can occur whenever more than one user is attempting to import BOMs at the same time.  The only way to resolve the error is to have only one person import BOMs at a time.  The BOM import must run more intensive routines than the other imports because it needs to validate that no BOM data being imported will end up as recursive (which can cause infinite loops in the software and, thus, many errors).