New GL and BW extractors

Folks, when we use the GL_10 datasource we dont seem to get document # information.

So do we still use GL_4 datasource. Does this mean Bseg will still be populated. I understand there are new tables like FAGLFLEXA and FAGLFLEXT from which GL_10 extracts.

I dont understand why SAP did not give an extractor for document number. I hear about gl_14 extractors but cant see in RSA5.

So what is the new business content which truly replaces the GL_4.

Also if we are not using GL_4 anymore do we have new set of datasource for AP and AR as AP_4 and AR_4 are coupled with GL_4. Or do I need to apply an OSS note and decouple.

Confused. What is the new GL, AP, AR content that replaces the _4 extractors.

Appreciate a response.