Successfactors RCM : Business rule to add Pick list value and Currency type fileds

[Parameswari]

I have the scenario like this.

I have to compute Total Salary (Currency type field) by adding different allowances.

Transport Allowance : Picklist

Mileage Allowance : Picklist

Housing Allowance : Picklist

Location Allowance : Currency

Total Salary : Currency

I am using Add Multiple () function to compute the Total Salary. However, while writing the business rule, system is only allowing me to pick up Basic and Location allowance which are of Currency Type. It is not allowing me to take the fields with Picklist type. So, the rule is incomplete.

Set Job Requisition(All). Total Salary to be equal to Add Multiple()

Number : Job Requisition(All). Basic Salary (Monthly)

Number :Job Requisition(All). Location allowance

Looking forward for some advise.