add word document in project systems with BAPI

Hi,

I want to create a project with documentation automatically.

I have created a project with following structure with BAPI_PROJECTDEF_MAINTAIN.

PROJECT

DOCUMENTATION

Now I want to add a word document in DOCUMENTATION.

I know how to add a document via transaction CJ20N, but that is not what I want.

I want to add a document via BAPI.

Do you know how I can achieve this with a BAPI ?

Thanks in advance,

Chu