Hi Jorge. You should try using the pex ground layer statement, and add all of the well names there. Then, it will pick up the lvs name of the substrate, instead of the generic node 0. For example, you could say pex ground layer nwell awell. Then if your nwell is connected to vss_analog in one section, and a different nwell is connected to vss_digital, then ground name will be different depending on which nwell you're inside of. Try this out, and let me know if it works.
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