Current/Charge conservation in AC/DC

Hello,

My model has several layers of domains having different conductivity and permittivity. I want current to be conserved in each domain independently. At present, I choose current conservation node for respective domains.
After solving, the volume integration of space charge denisty on all domains (i.e. the net charge) is zero. However, each domain is not independently conserved. Is there a way to specify independent charge or current conservation to each domain?

Thanks,
Arun