Unposted Refund - Need to Apply to Correct Item

Good Morning,

We have a scenario where our business user unposted a refund and we need to reapply this refund correctly but not sure how or the best way to accomplish this.  The scenario is the business user created an invoice for 207,934.19.  We received a payment of 209,682.47 which left a credit balance on the original item of 1748.28.  We generated the refund and sent the refund to AP to generate check.  We needed to rebill the customer so our business users unposted the original payment and the refund item.  They then created a credit invoice and rebill.  We were able to