INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 31, 2022

Notes and other explanatory information [abstract]

Schedule of Intangible assets

	Patent			Concession right			Software			Total
		CNY			CNY			CNY			CNY
Cost
As of January 1, 2021		22,878			—			274			23,152
Transfer in		—			20,430			—			20,430
As of December 31, 2021		22,878			20,430			274			43,582
Accumulated amortization and impairment
As of January 1, 2021		(22,388	)		—			(121	)		(22,509	)
Amortization charge		(105	)		(730	)		(49	)		(884	)
As of December 31, 2021		(22,493	)		(730	)		(170	)		(23,393	)
Net carrying amount
As of January 1, 2021		490			—			153			643
As of December 31, 2021		385			19,700			104			20,189
Cost
As of January 1, 2022		22,878			20,430			274			43,582
Additions		—			—			5			5
As of December 31, 2022		22,878			20,430			279			43,587
Accumulated amortization and impairment
As of January 1, 2022		(22,493	)		(730	)		(170	)		(23,393	)
Amortization charge		(36	)		(730	)		(47	)		(813	)
As of December 31, 2022		(22,529	)		(1,460	)		(217	)		(24,206	)
Net carrying amount
As of December 31, 2022		349			18,970			62			19,381
As of December 31, 2022 (US$)		51			2,750			9			2,810