Depreciation not getting triggered

Hi Team, We have created new asset classes and migrated legacy asset data for test and it successfully gotmigrated. In master data its showing depreciationschedule for ordinary depreciation for this period.However I am trying to run depreciation, its not runningthe depreciation for migrated assets. However if I post acquisition manually, its running depreciation for manual posted asset. Can anybody let me know if any idea for this issue? Thanks and Regards, TJ Does anybody have idea, like why