Cash flow with irregulars payment in Loans Management

Dear SAP Experts,

We are try to recreate a cash flow with irregulars installments, we need a different amortization than annuity or installment repayment. The interest method calculation is 365/360.

Our client, use the function excel CUMIPMT (to return the cumulative interest paid between to periods) for interest and the other function excel CUMPRINC (to return the cumulative principal paid on a loan between two periods) to re-create this kind of cash of flow.

I want to know if there any flow category and FIMA calc category indicators to recreate this kind of cash of flow.

Ivan R. Menacho