AS01 - Ordinary Depreciation Start Date issue

Hi,

When i am loading legacy assets in AS91, Ordinary Depreciation Start date is automatically populating in that field without giving manually.

But when i tried to create asset in AS01, Ordinary Depreciation start date is not coming automatically...What is the problem? How in AS01 - Ordinary Depreciation start date  will come automatically?

Please help me

Sap Guru