Hi Uma,
If you check the details in the link provided by you then you will find that user is trying to post depreciation for the month of Feb (Period 4) whereas the current month is March (Period 5). Also, the capitalization date is in Period 4 i.e. Feb. So, posting depreciation in previous period/month does not means posting in the period/month before capitalization occurs.
However in your case capitalization occurs in month of October and not August. Hence the value of asset is zero in August and not liable to depreciation. So, if your current month is November and no depreciation (or wrong depreciation) is posted in October then you can post depreciation for previous month (October) but not in August.
Hope this helps.
Regards
Pankaj Pareek