BAPI for F-28

Hi,

I am working on integration between non SAP and SAP project. in this i need to identify a bapi for f-28.

My scenario is when i save the values in non SAP for incoming payment automatically these values should flow to SAP application and our SAP version is 4.6c. We are unabled to identify the suitable bapi on that.

Can anybody give the adives how to solve the issue.

Have a nice day

Sateesh Kumar