Function

Reports vias that do not touch any solder mask clearances.
At such locations the via is covered by solder mask.

Activation

When the ignore_miss_via ERF variable is set to zero.

Known Limitations

If a via touches a solder mask clearance even at a single point,
this will be reported as a zero annular ring rather than as a Missing Via/Clearance.

This category is normally disabled through the default setting of the ignore_miss_via ERF variable (1).
The reasoning is that vias are supposed to be covered by solder mask.
For cases where vias are supposed to be exposed, turn on this analysis check by setting the ERF variable
ignore_miss_via ERF to 0.