I took a transmission down for a customer. Took it to a transmission shop and they rebuilt it. Picked up the transmission and paid for it. Returned and put the transmission back on and the customer charged me labor and having it rebuilt. How do I journalize this transaction.

I took a transmission down for a customer. Took it to a transmission shop and they rebuilt it. Picked up the transmission and paid for it. returned and put the transmission back on and the customer charged me labor and having it rebuilt. How do I journalize this transaction.
How do I journalize a transaction when I contracted it to another shop and I removed and put the part on the car