GN_INVOICE_CREATE -Need to create Invoice directly

Hi,

We are trying to create Invoice directly without reference, since our client requirement they track sales in Dynamics 365 and they want to use SAP to book Sales means only accounting document.

My abaper told me to pass entry in this FM and once it is success I need to provide test case.

I tried a simulation of this BAPI it is not behaving as other FM,as I am not getting any success or failure message.

Please advise how to use this BAPI.

I am using Hana 1809