Interest keys (T.Code FPI1) configuration is missing

Hi Expertise,

I m trying to post Interest in T.code FPI1 i m getting error message

No interest accruing on contract account XXXXXXXXXX

Diagnosis

• All items have been cleared before the due date (no overdue items exist)
• Interest has already been calculated on all items from the due date to clearing
• No interest key can be determined for the items.
• The settings maintained for the interest key do not permit the calculation of interest at the present time (for example, transfer days, tolerance days, interest frequency)
• Interest blocks exist.

Now query with underline point - No interest key can be determined for the items

Whats' is configuration to create Interest key and where i have to assign those keys ?

Please advise.

Regards,

Karthik Kovuru.