A Karma-prakṛti (type of Karma), the Sattā (time of non-fruition and persistence) of which is not always available in all living beings, e.g., Uccagotra (status-determining Karma qua high status), Samyaktva (right faith (deluding) Karma) etc...
kadācid bhavanti kadācinna bhavantītyevamaniyatā sattā yāsāṃ tā adhruvasattākāḥ.
(Kapra p.30)