Could be the condition payment no ? It's very common in Brazil somenthing go to a service,and the payment depends of the credit limit of the company with service provider,or the company make the service and the condition payment it's 30/60/90.
The most common situation are that:
1-The Vehicle goes to the service provider and vehicle generally is :Awaiting release for service,after that there is an order to the company authorizes the service,after that the vehicle start the service, after that the vehicle generally finished the service,after finished the service the vehicle is awaiting billing, after the billing is authorized the vehicle goes to the fleet's.
2-The most common situation it's the vehicle finished the service,the companies does not have credit limit with the service provider and the vehicle could waiting months with the service provider,or the service provider could release the vehicle by means of the payment of the oldest invoice,consequently the service provider release credit.
3-There is a demand for Gurtam in US for in-house maintenance (https://forum.gurtam.com/viewtopic.php?id=16715),this means that the fleet's could be internalized the maintenance cost and this situation could be present in Brazil due to the truck driver strike (https://www.wsj.com/articles/brazil-tru … 1527006248),the consequence was the companies decided internalize your cost buy your own truck due to the high price of the freight,however this situation could be present in any market.
4-We have a retread company in Brazil,this situation it's very common:The fleet's take the tire to retread and the tire goes to the process by means of credit analysis,and your status it's Awaiting release for service,the tire goes to the process when the fleet's pay for the oldest invoice,or the tire is produce and takes months in the industry for the fleet's authorize the billing.