Documentation of the interaction of components in ABAP - applications

Hello,

I am developing on an ERP 6.0 system with ABAP , ABAP-OO, business objects, workflow.

Now there are a lot of different components used, i.e. function modules, classes, business objects, dynpros.

I am looking for a way to document how all these components interact.

Ok, you can use PowerPoint to draw charts or use excel-tables, but these means aren't integrated into SAP.

So it is only a matter of time when the documents will be old and no longer up to date.

How do you make such documentation, is the visual composer a possible tool?

Best would be a tool, that offers the possibility to model the interactions in advance.

Has anyone an idea?

thanks in advance,

Dirk