7. Other operating income

in PLN thousand	For the year ended 31 December 2018	For the year ended 31 December 2017 (transformed data)
Compensations and fines received	75	1 494
Revenue from property, plant and equipment (including grants)	6 605	6 635
Reversal of doubtful debt allowance	877	735
Reversal of provisions (liquidation of tangible assets and reclamation)	-	299
Gain on sale of property, plant and equipment	55	1 949
Other	104	348
	7 716	11 460