In your rule file for the device description, is there something similar to this:
and are there property calculations as part of that device definition that use the TRUNC function?
It's possible that those calculations may need to be modified to account for situations where the device body or pins don't have the expected information related to them.
Yes, I did checked my rule file for extraction, and there is this device d(nwp_p) formed between p-substrate and n-well
An equation is used to define its property with "truncate" funtion. I will try to modify it and post the outcome.
In the mean time, can you explain what you meant by
situations where the device body or pins don't have the expected information related to them.
Here's a link to a TechNote that shows a detailed example of what I had in mind regarding potential problems with computing values associated with pins that may not actually have values attached: