If your cycle is Dec to Nov, then I would expect the 01.07.2014 is period 8 but not period 6 (Dec, Jan, Feb, Mar, Apr, May, Jun, Jul)
If the depreciation start date is 01.06.2013, I would expect your depreciation must have been posted only for six months (June, July, Aug, Sep, Oct, Nov). That means +3400 / 60 = 56.67*6 = 340. Whereas in your screen shot the it is showing as 453.34
If your last depreciation is period 05, 2015, then you have posted your depreciation until April. (Dec, Jan, Feb, Mar, Apr). For five months you should have posted taken in AS91 as 283.35, whereas you have taken as 340, which is incorrect.
If you observe there is also period 7 is missing in your depreciation calculation, could be this is how the take over dates are maintained. The take over date should be 30.06.2014, but not 01.07.2014.
You need to confirm with the business what they are expecting, accordingly you need to work out the data load / configuration.
Hope the above points would be helpful.