G/L account & exists. Secondary c. elem. does not exist

What causes this issue?

You chose the function "Create secondary cost element". Secondary cost
elements may not have equivalent accounts in FI , meaning this account
is not allowed to exist in FI as a G/L account. You attempted to create
a secondary cost element which already exists in FI as a G/L account.

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 whether you want to create cost element &V1& as a secondary cost
element.

Error message extract from SAP system. Copyright SAP SE.