Permission to Create Payment Request for Purchase Manager

I cannot find a way to give permission for Payment Request creation for role Purchase Manager. Even if I give permission in the role permission manager, the user is not able to create Payment requests.

I also tried to add it in the DocType, but editing doctype is restricted.

Any workarounds other than assigning Accounts Manager also to the specific user?

Have you tried using the Role Permission Manager?

Yes, doesnt work.

For the time being, I have given Accounts User to specific users.