for example you can use the

vendorbills

default value to populate the apply sublists on a vendor payment

dynamic mode has the option of just using sourcing, but usually you end up using the default values anyways when you start encountering badly maintained accounts with thousands of unpaid bills or when there are user filters hiding bills

vendor primary currency: 1 vendor bill currency: 8 subsidiary currency: 7 vendor bill amount due: 1000 what I need to pay: 500

var rec = record.create({
    type: record.Type.VENDOR_PAYMENT,
    isDynamic: false,
    defaultValues: {
        subsidiary: 26,
        entity: '3335280',
        vendorbills: '6706319',
    }
})

Above will give me a record without any lines in the apply sublist. As the primary currency of the vendor is different from what the bill is, I need to change it. Adding currency: 8 to the default values gives me "You have entered an invalid default value for this record transformation operation." Even if the vendor primary currency was the same as the bill, the sublist would be empty. How would I change the payment amount?