Interest on Arrears_ Mortgage loans

hi

I activated the business function EAFS_CML_IOA and configured for Mortgage loans category to implement IOA function.

- calculation base for the condition as '8888' - reserved for IOA is this right?

- Flow category - VEZ1 and calculation category - TB

I am getting the error message 'Save not possible; interest on arrears calculation results in amount 0.00 '.

Appreciate any help.

Thanks,

Prabha