Two part I's in this situation. One for John conducting on behalf of another and one for the business for the person on whose behalf transactions are conducted.
What impacts the number of part I's is if more than one role in item 2 applies to a person. In your example, if John had also made a deposit to his personal account, John would end up with two Part I's One for the transaction(s) he conducted on his own behalf and one for the deposits conducted on behalf of another.
Deposits to a different account of the same business are still John acting in the same role of depositing on behalf of another. In this instance you would just list additional account numbers for the same Part I.
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