Company code & is live in Financial Accounting

What causes this issue?

You want to reset the Asset Accounting data for company code &V1&. This
company code has already been designated as live in Financial
Accounting. In addition, there is at least one transaction in Asset
Accounting, for which a document (here: &V2&) has been created.

System Response

Due to the integration of the system, you cannot delete the data for
this company code from Asset Accounting.

How to fix this error?

If setting this company code to live in Financial Accounting is an
error, you should change the setting in FI Customizing.
Otherwise, you should analyze the situation with the help of your SAP
consultant. If you reset the data, you risk inconsistency between the
general ledger and the subsidiary ledger.

Error message extract from SAP system. Copyright SAP SE.