tagOn is used with the cur-point conjunct which is a violation agains the 7. Validation Rule #3
Description
Validation:
7. Verify tagOn only used on a tag defs (not conjuncts or feature keys)
The violation is in the Lib: phIot
https://project-haystack.dev/doc/lib-phIoT/curVal
i thing the tagOn tag e.g. for curVal, curStatus, curErr should be used with the y:cur def.
Please check the Haystack 3 documentation
https://project-haystack.org/tag/cur