Prepayment Invoice

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Ex: I created  suppliers as employees and create Prepayment invoice for (Employee X) and Amount is 1000 USD.

And apply it on standard invoice with amount 800 USD and the remaining amount of Prepayment is 200 USD.

My question: I need to transfer the remaining amount 200 USD to another supplier (Employee Y) to close this prepayment and still create separate invoices for Employee X and Employee Y without using Supplier merge.

thanks