Components of salary for calculation of wages

Respected Sir We have a query: - In our salary components we have Basic, Personal Pay, HRA, Washing Allowance, Conveyance allowance and no DA - While calculating gratuity, do we have to take Basic and Personal Pay for calculation of gratuity or only Basic is enough - One of our employees is fighting for Basic + Personal Pay for calculating gratuity Shall be grateful, if you could kindly clarify whether we should consider Basic and Personal Pay for calculation of Gratuity or only Basic to be considered Your urgent reply with relevant case laws is highly appreciated. Regards