My organization was not willing to provide any roles and responsibilities letter. This is what I submitted:
1. An email from the HR department stating they don't provide detailed roles and responsibilities letter and just provide the verification letter in a standard format.
2. The standard document provided by the HR department.
3. Notarized roles and responsibilities letter from a senior under whom I had worked.
4. Seniors visiting card.
5. Another notarized roles and responsibilities letter from another colleague. I got this just to be on the safe side, since the one in #3 was about an year old.
6. Vising card for #5
Apart from these, I just wanted to make sure that they have a way to confirm my employment so I added:
1. 6 Months salary slip
2. CTC breakup letter
3. Offer Letter
4. ITR.
I applied in Mid Oct and got PPR in Dec. This is just what I did and might help you in collecting/submitting documents. However, you must note that each application is different and may be processed by different case officers in a different way. All the best.