You are getting the Error : "Depreciation method XXXX still used in fixed asset XXXXX ", When you are trying to update the change project system in the test system using the option Update Project from Production.
SAP Business ByDesign
Reproducing the Issue
1. Go to Business Configuration work center and select Implementation Projects.
2. Select the relevant change project and then choose Actions.
3. In the Actions, Choose Update Project from Production.
4. You will get the Error : Depreciation method XXXX still used in fixed asset XXXXX
The merge is prevented by a veto check which is based on a changed depreciation method. Once a Depreciation method is used in a fixed asset, it cannot be changed any more.
The veto check will raise an error even if you have changed any flag under the tab Calculated Parameters.
Revert the changes, Which you have done in Depreciation method and then try to merge the Project.
If all the parameters of Depreciation method in test tenant matches with the Production system, then the merge will be successfull.
Change Project, Merge, Depreciation method , KBA , AP-RC-BCT , Business Config. Tools (SAP Business ByDesign , Problem