The Schedule of Assets ( or Inland Revenue Affidavit) is a document of Public Record once Probate issues and is freely available to anyone on payment of a small fee to the Probate Office. Equally, if an executor is so minded they could choose to let you see a copy but they are not obliged.
Why does the beneficiary want to see it? I have this vision of all these paranoid beneficiaries suspecting the executor of dreadful skullduggery.
Given that the Schedule of Assets goes to Revenue Capital Taxes and can easily trigger a Revenue audit of the Deceased's tax affairs.............I've had two in my time and ( if you were'nt already) you'd be reeeeeeeeeeeel careful to advise an Executor of all their obligations in the collection and distribution of an Estate.
My experience ( yes, one sided I know) is that there are far more paranoid Beneficiaries ( who bizarrely were not asked by the Donor to be their executor- I wonder why?) than dug skullerying Executors.