SAP Message CACSELT118 - Error while determining ELT rule for assignment rule '&1'

Diagnosis
The system has received a request to create a worklist
for entitlement and liability transfer. Thisrequired the determination of a rule for entitlementand liability transfer. However, an error has occurred. No rule wasfound, or more than one valid rule was found. Further processing istherefore not possible.

System Response
Processing is terminated without results.