Cannot delete providers in stg

[manumoreira]

Cannot reproduce this issue consistently, I've tried:

• Add providers, add to project, delete project, delete provider
• Add providers, add to project, back to draft, changed providers, delete providers
• Add providers, add to project, create scenario, make changes in providers, delete project, delete provider
• Add providers, add to project, create scenario, make changes in providers, back to draft, changed providers, delete providers
  Still I'm not being able to delete the providers I have in stg