Existing benefactors can create registration references

One-sentence description

Existing benefactors can create registration references

Current behaviour / Reproducing the bug

  1. Create a registration or renewal for a benefactor
  2. Login as benefactor
  3. Create reference for the new benefactor
  4. Works

Expected behaviour

  1. Create a registration or renewal for a benefactor
  2. Login as benefactor
  3. Create reference for the new benefactor
  4. Error
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