These entries will also not reduce commitment amounts for invoiced or dollars paid.
The Miscellaneous JC cash receipt type will update the Payments field on the Job setup Receivables record.
Miscellaneous JC cash receipt types do not get WIP ID's so even though they reduce costs in Job Cost, the transaction will not flow to BL as there will not be a WIP id. If the item is needed in Billing, please follow How do I enter a refund from a vendor in Accounts Payable?