Do I have the right to see documentation of an alleged complaint against me?

I have worked for the same company for 4 years now and I am well respected by my peers. The company recently made several changes which has resulted in a wider gap between clinicians and middle management. Many of my peers are coming to me with issues that normally would go to management. I have allowed people to vent and then offered ways to approach management. I received a written warning from management claiming that a co-worker was uncomfortable with my negativity. Although I absolutely respect the right of this alleged person to remain anonymous, do I have the right to request a copy of the complaint without identifying information? They have told me the complaint was verbal with no documentation. If this in fact does lead to termination proceedings, an I then able to request open, documented disclosure of the accusation? Thanks for your help.