First, make sure you have read the Guide:
https://forum.manager.io/t/how-to-use-expense-claims/6898
As explained there, an expense claim where the Payer is an Employee, the claim is posted to Employee clearing account. You do not have to enter it on a payslip at all. When you pay the employee, just make payment for the full amount of the employee’s balance in Employee clearing account.
The reasoning here is that payslips are for work performed for the company and create a liability for the company to pay the employee. Expense claims are for expenditures on the company’s behalf by the payer, with no work involved.