Hi
Your ledger defintion is not complete. Have you maintained the required configuration in the below path:
IMG>Financial Accounting>Financial Accounting Global Settings>Ledgers>Ledger>Define Settings for Ledgers and currency types
Here the ledger Z1 must be configured for your company code. You need to assign the same accounting principle which you will be using in your depreciation area. Also the accounting principle must be assigned to ledger group as well. Also make sure for each currency of your company code, you have a depreciation area. For eg, if your company code currency is USD and Currency 2 is INR, you must have tax depreciation area for both USD and INR.
Regards
Sanil