SAP Message WB2B_TEW073 - Error in Customizing for association check classes

Diagnosis
A Customizing error occurred.

System Response
The function is terminated.

Procedure
INCLUDE ISR_VERWALTUNG

Procedure for System Administration
In Customizing, association check class &v1& was entered, but this doesnot exist in the system. Ensure that no typing error was made:
Define check class under "Check Class ByAssociation".