Hi,
I just imagine your scenario is the very basic one.
One deprecation key consists of
a) Base method ( for your case you can use 011)
b) Double-decline method ( for your case you can use 0001)
c) Period control method (Please select one or create one based on your requirement, you can use 001 to test and confirm)
d) Multi-level method - (For your case, create one multil-level method with just 1 level, and use the base value as 10 ).
(please note depreciation key can be very complex also, please test and confirm)
Please test and see.