question about multisphere defination

In the newly released LIGGGHTS,serial multisphere method is included.
During the defination of a multishpere using the commad [fix particletemplate/multisphere], it says in the comman description that "As an alternative, the body's mass and inertia tensor can be specified directly via keywords mass and inertia_tensor. Note that you can use these keywords only together"and the follwing says "if keyword use_volume is specified, LIGGGHTS(R)-PUBLIC will use the specified mass and volume_mc (the volume of the particle template calculated by the Monte Carlo procedure), and calculate the density from these two variables".
Does this description means that the keywords "density" in the commad [fix particletemplate/multisphere] is meanless and density is reset when the opt_keywords [mass] [inertia_tensor] and [use_volume] are used together.
The intuitionistic way is discarding the keyword [density] when I using the opt_keywords [mass] [inertia_tensor] and [use_volume] to caculate the density automatically, but that will cause a error.
The question is whether the keywords "density" in the commad [fix particletemplate/multisphere] is meanless and density is reset when the opt_keywords [mass] [inertia_tensor] and [use_volume] are used together.