7. Other operating expenses

EUR 1,000 2016 2015



Subcontracting -3,175 -5,018
Office management costs -4,372 -3,870
Travel expenses -6,563 -5,392
Impairment losses on receivables -10,897 -1,779
Agent fees -84 -787
Rents -2,248 -2,390
Professional services -3,229 -2,703
Marketing -488 -543
Other expenses -153 -21
Other operating expenses total -31,209 -22,504



Impairment losses were recognised on trade receivables totalling EUR 64 (1,052) thousand and on receivables related to construction contracts totalling EUR 11,143 (727) thousand.



Auditors' fees

Audit KPMG -149 -187
Tax consulting KPMG -28 -45
Other services KPMG -86 -40
Other services, others -15 -14
Audotrs' fees total -278 -286