Retrieve list of linked documents in SAP

There are lots of RFC present to fetch the list of documents. You can try any permutation and combination to identify which suits your requirement

• BAPI_MATERIAL_GETLIST
• BAPI_DOCUMENT_GETOBJECTDOCS
• BAPI_DOCUMENT_GETOBJECTLINKS
• BAPI_DOCUMENT_GETDETAIL

 I prefer that you better try with BAPI_DOCUMENT_GETOBJECTDOCS, I have used it to achieve something similar in the past.