at Vin.ii.8 is to be spelt vattabba (see vattati).

…Vin.iii.186 (grd. ˚vatthabba); Vin.iv.30, Vin.iv.127; DN.i.176; MN.i.391; SN.ii.21; Snp.697 (= pabbajitvā tāpasavesena vasati…

…Snp.678; Pv-a.42; & vatthabba Mhvs.3 Mhvs.12;
inf. vatthuṃ Thig.414, & vasituṃ…

…tena bhikkhunā akāmā parivatthabbaṃ (for as many days as he knowingly conceals his sin, for so many days…), parivuttha-parivāsena…