A tat-puruṣa compound ending with the words upajñā 'invention' and upakrama 'commencement' is neuter in gender, when it is intended to express the starting point of a work which is first invented or commenced.,
As, पाणिन्युपज्ञमाकालापकं व्याकरणम् 'the grammars Kalapa &c., had their commencement with Panini's invention'; व्याड्युपज्ञं दुष्करणं 'Vyadi, invented Dushkarana'; आढ्योपक्रम प्रासादः 'the palace is an invention of rich folks'; मन्दोपक्रमाणि मानानि 'the measures are the invention of king Nanda.'
Of course, when it has not this sense, the neuter gender is not employed; as देवदत्तोपज्ञो रथः 'the chariot made by Devadatta,' यज्ञदत्तोपक्रमो रथः 'the chariot commenced by Yajnadatta.' So also the sense may be that of invention &c., but when these words are not employed, the neuter gender is not used; as वाल्मीकिश्लोकाः 'the slokas invented by Valmiki.' N. P. Prof. Bohthlingk gives पाणिन्युपज्ञमकालकं व्याकरणम् 'The Grammar omitting the time of day is the work invented by Panini, 6.2.14.,