No returns activities determined for reason-Message no. >B501

Hi Experts,

When i process returns through return lot (FP09) i am getting the below error so i checked the configuration for returns and cfreditworthiness then everything is right but this below error is coming.

please give best suggestions to solve this issue

Error: No returns activities determined for reason

Message no. >B501

Diagnosis

No returns activities could be determined.

The most common reason for this message is a missing entry for creditworthiness = 0000 in Customizing

Thanks,

Cherry.