Tena samayena buddho bhagavā sāvatthiyaṁ viharati jetavane anāthapiṇḍikassa ārāme.At one time the Buddha was staying at Sāvatthī in the Jeta Grove, Anāthapiṇḍika’s Monastery. Tena kho pana samayena chabbaggiyā bhikkhū kāyappacālakaṁ antaraghare nisīdanti, kāyaṁ olambentā …pe….At that time the monks from the group of six were swaying and leaning their bodies while sitting in inhabited areas. …

“Na kāyappacālakaṁ antaraghare nisīdissāmīti sikkhā karaṇīyā”ti.
antaraghare → antaraghare gamissāmīti (pts)“‘I will not sway my body while sitting in inhabited areas,’ this is how you should train.”

Na kāyappacālakaṁ antaraghare nisīditabbaṁ.One should not sway one’s body while sitting in an inhabited area; Kāyaṁ paggahetvā nisīditabbaṁ.one should sit keeping one’s body straight. Yo anādariyaṁ paṭicca kāyappacālakaṁ antaraghare nisīdati kāyaṁ olambento, āpatti dukkaṭassa.If a monk, out of disrespect, sways and leans his body while sitting in an inhabited area, he commits an offense of wrong conduct.

Anāpatti—There is no offense: asañcicca,if it is unintentional; assatiyā,if he is not mindful; ajānantassa,if he does not know; gilānassa,if he is sick; vāsūpagatassa,
vāsūpagatassa → vāsupagatassa (sya-all)if he has entered his dwelling; āpadāsu,if there is an emergency; ummattakassa,if he is insane; ādikammikassāti.if he is the first offender.

Chaṭṭhasikkhāpadaṁ niṭṭhitaṁ.The sixth training rule is finished.