An internal error occurred

What causes this issue?

No interest calculation method for settlement process type &V1& is
defined in Customizing.

System Response

INCLUDE ISR_STOP

How to fix this error?

Check Customizing for <DS:SIMG.W_WLFA_0010>Settlement Process Types</>.
INCLUDE ISR_CUSTOMIZING

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.