I personally would set up a recurring entry for the payment and code the entry to 7400 vehicle hire or one around that area if you will never own the vehicle- it will be an expense rather than an asset as the 0050 would show it as
A recurring bank payment should be fine, but as you are not purchasing an asset it should not go in 0050.
The lease is a long term liability and should be in the balance sheet and reduced as you pay it, but if you do not maintain a balance sheet, posting it to a new expenditure account 73xx would be fine as the accountant can pick it up from there, just label it nicely as "Vehicle Lease Payments" so it is easy for them to spot.
__________________
For just about anything Sage :- switch to renting, pay-as-you-go sage support, sagecover, upgrades, application integration, reports, layouts, analysis or any other help making life with sage easier/less time consuming Contact me.