Hi Michael,
The rebate accrual account is a temporary account, after processing, it will be written off. Please have a look the official doc:
After claims have been approved, the status changes to Approved. At this stage, the rebate accrual account has been debited, and the rebate expense account has been credited. These accounts temporarily hold the debits and credits, until final processing of the claims is performed.
After claims have been processed, the status changes to Completed. At this stage, the following events occur:
The rebate accrual postings that were created upon approval are reverted.
The sum of the rebate amounts is credited to the procurement expense account.
The sum of the rebate amounts is debited to the vendor balance that is shown in the vendor invoice.
docs.microsoft.com/.../work-with-vendor-rebates
The account entries of Vendor Rebate invoice voucher is as described above:
Debit: vendor
Credit: procurement expense account (default from procurement category in rebate program of Procurement and sourcing parameters)