User permission problems

I am a system user and I have encountered a problem while trying to save my Purchase Order, stating that I did not have the permission to perform the action. All the role check boxes have been ticked. I have access to all modules but I don’t really know how to use the permission system. I’ve never had this issue before today.

share role permission page screen

  1. Check the roles assigned to you

  2. Open role permission manager and select “Purchase Order” in doctype and check the permissions given.

  3. Lookout if “Apply User Permissions” is checked or not. If so, have the user permissions been configured appropriately?