Account group &1 for competitor &2 is not allowed

What causes this issue?

Competitors are modeled as customers. When you create the customer
data, you should use an account group that is flagged as a "Competitor
account group".
The account group &V1& for competitor &V2& is not a competitor account
group, however.

System Response

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

How to fix this error?

Check the customer data for competitor &V2& and change the account
group if necessary.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.