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The down payment made on behalf of another company should have been recorded as a note receivable 'Other current asset' account because it was not an expense for you - you just borrowed someone money. If that transaction was recorded in a previous, closed period, then you should enter the deposit and assign the same reimbursable expense account to the deposit. This will reduce your expenses in the current period to compensate for your expenses being overstated in the previous period. If the down payment was recorded in the current period, I would reassign the down payment to a note receivable account and then assign the deposit to the same account.
It's worth mentioning that the IRS requires you to charge interest when you loan money to another company. This may be immaterial in this case, but if it was a significant amount and over a long period of time, the interest can be significant. The current IRS AFR is between 2.5 - 4.5% +/-.
