SAP Requires an Assignment to a CO Object

The first time Account 820290 was only created in FI as a primary expense. After that this account was created in CO too as a secondary expense and any posting will appear an error: Account 820290 requires an assignment to a CO object

Question : How to correct this account back to FI only and not to appear in co?

Note :
Account 820290 requires an assignment to a CO object
Message no. KI 235

Diagnosis
You have not defined a CO account assignment for an account that is relevant to cost accounting.

System Response
Account 820290 is defined as a cost element.
This means that you must always specify a CO account assignment.

Procedure
Enter one of the following CO account assignments

Order
Cost center / cost center/ activity type
Sales order item (for a project or cost relevant)
Project / WBS element
Cost object (Process manufacturing)
Network/ Network activities
Business process
Profitability segment
Real estate object
The posting row affected is 000, account 820290.

First, if G/L account was created in FI, you can only create primary cost element in CO.

Secondary cost element can only be created if no account exists in FI.

Second, if you created the primary or secondary cost element in CO, you have to assign CO account assignment.

You can delete cost element in CO (KO04) if dependent objects found.

Third, when you create cost element in CO, documents would be also created in ‘Cost center accounting’ and ‘Profit center accounting’ when posing in FI. If no cost element exists in CO, no related documents would be created in CCA and PCA.