How do we key in a loan that is already 1 year old

Hi SAP Gurus,

Good day.

Would like to request for your advise on below queries.

How do we key in a loan that is already 1 year old? , ie, principal disbursed 1 year ago, 1 year worth of exchange rate revaluations, interest accruals and interest revenue recognition that have been put through manually. How do we capture the loan as is in but do not have the accounting entries that flow for past months?

Thanks in advance