Document retrieval from 3rd party DMS

Hi Experts,

I need to retrieve a pdf file from an external DMS. i have to write a program that will:

1. Display the list of released Prod Orders (ALV) - done

2. Open the Corresponding BMR(batch manufacturing record) for the specified Released PO.

3. Pass 2 values from the report to the BMR pdf file

Are there FM's for this?

Thanks and Regards,

FA