The minimum margin for profit group &1 has no currency key

What causes this issue?

An error has occurred in Customizing.

System Response

The function was cancelled.

How to fix this error?

INCLUDE ISR_VERWALTUNG OBJECT DOKU ID TX

Procedure for System Administrators

Check the Customizing settings in your system for
<DS:SIMG.W_WLFA_0021>Profit Groups</>. No currency key was been entered
for the minimal margin for profit group &v1&.

Error message extract from SAP system. Copyright SAP SE.