20 Deferred revenue

	2014		2015
CHF 1,000	Current	Non-current	Current	Non-current
Advance payments received related to product sales to be recognized upon delivery or customer’s acceptance	5,650	19,123	8,738	20,759
Deferred income related to service contracts	19,167	–	21,894	–

Construction contracts in progress
Aggregate amount of cost incurred and recognized profits	(3,720)	–	(7,066)	–
Amounts of advances received	5,152	–	7,672	–
Subtotal construction contracts in progress	1,432	–	606	–

Balance at December 31	26,249	19,123	31,238	20,759

Increase		25,359		7,191
Acquisition through business combination		200		20
Translation differences		1,074		(586)
Total change (current and non-current) compared with previous year		26,633		6,625