In its effects subreption is equivalent to obreption.
2.
Subreption may be intentional and malicious, or attributable solely to ignorance or inadvertence.
3.
To say that I know empirically that my will lifted my arm would be a subreption in Wolff's sense.
4.
The Latin phrase for the philosophical concept of subreption is " vitium subreptionis "-vitium : fault, crime, error; subreptionis : creep, stealth, fraud.
5.
To miss this distinction would mean to commit the error of subreption, and, as he says in the last chapter of the dissertation, only in avoiding this error does metaphysics flourish.