`depreciation_method` (depreciation method)
depreciation_method (depreciation method)
depreciation_method is part of the fixed assets master data. Bookkeeping uses it to keep the register stable and to support deterministic posting, validation, and review workflows.
The fixed-asset register schema allows only values defined in its enum. The current schema supports the canonical value straight_line_monthly. The bus assets CLI may accept the alias straight-line and normalize it to straight_line_monthly when recording an asset; any other method token is invalid and must be rejected or normalized so that validation succeeds.