Customer account group &1 is not available; check Customizing settings

What causes this issue?

The <ZK>Customer/Vendor Integration (CVI)</> Customizing activity
<DS:SIMG.V_TBD001>Define Number Assignment for Direction BP to Customer
</> contains a customer account group that is not defined in the
<ZK>Customer </>Customizing.

System Response

The harmonization report
<DS:RE.MDG_BS_SUPPL_HARM>MDG_BS_SUPPL_HARM</> cannot check the CVI
Customizing that is related to the customer account group.
The Customer UI cannot use the related customer account group.

How to fix this error?

Check and correct the Customizing settings for business partner groups
under <ZK>SAP Customizing Implementation Guide</> -> <ZK>Financial
Accounting</> -> <ZK>Accounts Receivable and Accounts Payable</> ->
<ZK>Customer Accounts</> -> <ZK>Master Data</> -> <ZK>Preparations for
Creating Customer Master Data</> ->
<DS:SIMG.SIMG_CFMENUORFBOBD2>Define Account Groups with Screen Layout
(Customers)</>.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.