22a. Non-current trade receivables

in PLN thousand	As at 31 December 2018	As at 31 December 2017
Receivables due from finance lease	6 376	6 819
Receivables due from sale of tangible fixed assets	1 257	1 910
Advances for construction in progress	2 093	-
Other receivables	210	209
	9 936	8 938

22b. Trade and other receivables

in PLN thousand	As at 31 December 2018	As at 31 December 2017 (transformed data)
Trade receivables due from related parties	36 106	48 274
Trade receivables due from other entities	79 578	76 610
Tax and social security receivables	-	3 031
Receivables due from compensations for stranded costs	165	2 043
Receivables due from compensations for gas compensation	-	6 938
Receivables due from sale of tangible fixed assets	718	718
Receivables related to the guarantee fund	54 362	2 892
Receivables due from balance market	420	420
Prepayments and deferred costs in respect of the program of connecting buildings to the heat distribution network	1 618	1 718
Prepayments and deferred costs in respect of property and civil liability insurance	3 924	3 838
Finance leases receivables	438	446
Other receivables, prepayments and defered costs	119	530
	177 448	147 458

in PLN thousand	As at 31 December 2018	As at 31 December 2017
Gross overdue receivables
up to 1 month	2 313	810
over 1 month up to 3 months	40	38
over 3 months up to 6 months	19	4
over 6 months up to 1 year	33	10
over 1 year	688	2 124
	3 093	2 986
Allowances for overdue receivables	(2 654)	(2 215)
Net overdue receivables	439	771