No number range assigned to vendor account group &1; check Customizing

What causes this issue?

The Customizing settings for the current vendor account group are
incomplete. The vendor accout group is not assigned to a number range.

System Response

The harmonization report
<DS:RE.MDG_BS_SUPPL_HARM>MDG_BS_SUPPL_HARM</> cannot use the account
group, neither to check existing <ZK>Customer/Vendor Integration (CVI)
</>Customizing nor to create new Customizing.
The Vendor UI cannot use the vendor account group.

How to fix this error?

Check and correct the Customizing settings under <ZK>SAP Customizing
Implementation Guide</> -> <ZK>Financial Accounting</> -> <ZK>Accounts
Receivable and Accounts Payable</> -> <ZK>Vendor Accounts</> ->
<ZK>Master Data</> -> <ZK>Preparations for Creating Vendor Master Data
</> ->
<DS:SIMG.SIMG_CFMENUORFBOBAS>Assign Number Ranges to Vendor Account
Groups</>.

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.