bluegen.net , page-53

It says in the half year report:
"orders for 329 units have been fulfilled and the remaining open order book of 332 units is expected to be supplied across 2013"

Any ideas on why there is a discrepancy between the number of orders filled and the number installed and switched on? Surely it doesn't take that long to have them installed. The positive is we should see over 600 installed by the end of this year.