How do I set up to accrue leave while an employee is on LWOP?

I have 1 employee who is paid weekly but does a 2 weeks on 2 weeks off rotation. I have just realised that his annual leave accruals are incorrrect because they are not accruing the weeks he does not get paid. Can anyone tell me how to manage this problem correctly please?

I am using Reckon Accounts Enterprise; Manufacturing & Wholesale 2017