6. Other operating expenses

EUR 1,000 2019 2018



Subcontracting -1,560 -1,407
Office management costs -2,455 -1,841
Travel expenses -1,018 -752
Agent fees -658 -624
Impairment losses on receivables -576 -756
Rents -331 -331
Professional services -961 -1,761
Marketing -435 -158
Other operataing expenses to Group companies -10,170 -12,574
Other operating expenses total -18,164 -20,204



Impairment losses were recognised on trade receivables totalling EUR 576 (116) thousand and on receivables related to other project receivables totallling EUR 0 (639) thousand.


Auditors' fees

Auditors fees -142 -154
Auditors' fees total -142 -154