Below three points should be checked :
1) We will have to check in CTC mapping if it is Paid component , Variable component and Reimbursement component.
Find the below path to check in CTC mapping :
3) And in the add on module the cut-off dates should be checked.
Go to Configure >> Company profile >> Add-on modules >> Reimbursement >> Check on the cut-off dates.
4) And Manager should be assigned to the employees.