Update of account strings through rapid implementation is not working as expected

We are attempting to bulk update of the accounting strings for all accounts in Manage Asset Categories through Update of fixed assets sheet. Although the Upload Fixed Assets scheduled process completes successfully, the account code combinations are not updating as expected. Additionally, in the category setup, all accounts are greyed out except for Depreciation and Bonus Depreciation.

Could you please advise if I’m missing something here, or if there is any other process required to update the account code combinations?