The Depreciation End Date field in a FAM Asset is auto-calculated via script from the FAM Bundle. The date is calculated by adding the Depreciation Start Date and the Asset Lifetime fields.
When uploading the FAM Asset via CSV Import, there might be instances wherein the Depreciation End Date field will be blank even if the Depreciation Start Date and the Asset Lifetime fields are populated.
The reason for this behavior is because Run Server SuiteScripts and Trigger Workflows was unchecked during import, which prevented the script from executing on the FAM Asset when uploaded via CSV Import.