Manage Subledger Accounting Descriptive Flexfield - Not Editable

Summary

Try to create DFF using Manage Subledger Acccounting Descriptive Flexfied, but the update button is grey out and cannot add or edit the existing DFF provided

Content

Not able to create DFF field to Use in Create Subledger Journal Entry UI, Tried to edit the DFF using Manage Subledger Accounting Descriptive Flexfield but edit option is grey out.