Pull Request command should support creating PR from forked repo

[Edit] Converting the issue to a enhancement
**PR create command should support creating a new PR from a forked repo into the source repo.**

**Original reported issue:**

I use the following command:
az repos pr create -r -s master -t master

I get the return message The source branch, "refs/heads/master", can not be the same as the target branch.

To set the context:
On devops on Azure I have a main repo of the project, and I have a forked repo of the main, which I work on.

I want to do a pull request from forked repo's master branch to the main repo's master branch. I am running the command in the folder of the GIT repo on my local machine, so I am assuming the az tool will pick up source repo's ID.

I need some guidance on my command please.