Things to check in Xero:
Tracking Category - if you need this information to come across with the time sheets you will need to set this up for timesheets in Xero.
Calendar - ensure the employee's calendar is set to Weekly rather than Fortnightly.
Things to check in LiveCosts:
Company Currency - check this is set to AUD
Working Week - ensure this aligns with the working week format you have in Xero
Tracking Category - you can check this has been brought across to LiveCosts in Settings > Accounts & Tracking > Tracking Categories.
Default Tracking Category set against a Project - check the project has a default tracking category set as you cannot select this when posting the time entry to Xero.
Employees - ensure the employees you wish to post the time entries/sheets for are set up in both LiveCosts and Xero and are linked.
Hourly Rates - you will need to import the hourly rate names from Xero to LiveCosts and then update the rates accordingly.