The inquiry is currently examining how the Church of England handled the allegations of sexual abuse.
Charles' lawyers have argued that asking for a witness statement was 'unfair' and the request was constituting 'intensely private and confidential' personal data.
The prince will not give evidence in person but will have the statement read out at the hearing on Friday.
It is believed Charles' statement will say that he was 'not aware at the time of the significance or impact of the caution that Peter Ball had accepted', including the fact that a caution involves admission of guilt, according to The Telegraph.
Former bishop Peter Ball was convicted 22 years after the abuse allegations originally surfaced.
Ball eventually admitted to sexual misconduct in a public office and two counts of indecent assault.
The court heard that Ball convinced some of his victims to strip naked to pray and even suggested they submit to beatings between 1977 and 1992.
The first of his victims to come forward took his own life in 2012 after hearing that Sussex Police had reopened the case.
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