This term is generally used in adverts and will depend on the role. It can include anything frrom Accounts reconciliations or analyses. Reporting KPIs. Preparing accruals and prepayments. Valuing stocks. Payroll analyses. Inputting etc etc
Every job role will be different. I wouldn't let the term put you off. No doubt you will have assisted already. One thing you need to bear in mind is the limitations in the role. If all you have on your PER record is assisting in the preparation then you might not meet the criteria for membership.
