Lease Management Asset Depreciation

Hi Everyone,

Quoting from the implementation guide for Real Estate Management:

"Define depreciation defaults

Depreciation default accounts must be defined in the Depreciation Defaults program (P12002) for the company, object, and subsidiary combination for the asset account. Assets that are processed using lessee accounting must have Ledger Type = AA and Depreciation Method = 00 (no depreciation). The computation method is also required"

Q1: why this is a must

Q2: what will go wrong if i didn't follow the rule and override an asset with actual depreciation information

Q3: will it make a difference if the lease is finance or operation lease ?

Thanks