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2. Net sales

EUR 1,000 2017 2016



Revenue from contract work recognised by stage of completion (IAS 11) 11,311 19,667
Revenue from maintenance and support (IAS 18) 31,237 28,947
Revenue from goods and services (IAS 18) 13,777 11,060
Currency exchange gains and losses -1,252 402
Net sales total 55,075 60,075



Order book for contract work 2,311 12,742
Order book for maintenance and support, goods and services 23,928 12,112
Order book total 26,238 24,854



Projects in progress:

Cumulative revenue recognised for projects in progress 9,495 15,050
Cumulative invoicing for projects in progress recognised by stage of completion 11,966 14,651
Accrued income related to construction contracts, work in progress -2,471 399



Aggregate amount of costs incurred for projects in progress 6,145 4,372



On the reporting date, the Group has no retentions held by customers. The Group has not received any advances related to projects in progress.