Hi Karthick
Unfortunately, there is no official solution for integration SharePoint libraries and SAP DMS. However, since SharePoint 2013 provides various flexible development support, you may consider creating a SharePoint Add-In(previous named SharePoint App) as a
bridge for SharePoint and SAP. SharePoint provides rich REST APIs and CSOM for remote calling to SharePoint resources in a security manner, so it is easy to get the document information from SharePoint. Regarding the SAP part, you may consult SAP support to
see whether SAP DSM has similar web services for remote usage. If so, the SharePoint Add-In would be a feasible direction.
Get started creating SharePoint-hosted SharePoint Add-ins
https://msdn.microsoft.com/en-us/library/office/fp142379.aspx
Alternatively, you can try to look for some third party solutions for the SharePoint and SAP integration.
Thanks,
Reken Liu