The 2-fold division, kamma and upapatti, is probably found for the first time in Vibh. of the Abh. Canon, but it expresses throughout the genuine teaching of the suttas.
”becoming”, ”process of existence”, consists of 3 planes: sensuous existence (ka^ma-bhava), fine-material existence (rúpa-bhava), immaterial existence (arúpa-bhava). Cf. loka.
The whole process of existence may be divided into two aspects:
(1) Karma-process (kamma-bhava), i.e. the karmically active side of existence, being the cause of rebirth and consisting in wholesome and unwholesome volitional actions. See Karma, paticca-samuppa^da (IX).
(2) Karma-produced rebirth, or regenerating process (uppattibhava), i.e. the karmically passive side of existence consisting in the arising and developing of the karma-produced and therefore morally neutral mental and bodily phenomena of existence. Cf. Tab. - (App.).