Revalidate array field on array items update

<form.Field
  name="commissionPayablePercentages"
  mode="array"
  validators={{
    onChange: ({ value }) => {
      const total = value.reduce(
        (sum, item) => sum + Number(item.percentage || 0),
        0
      )
      return total !== 100 ? ['Total must be 100%'] : []
    },
  }}
>

<form.Field name={`commissionPayablePercentages[${i}].percentage`}>
  {(f) => (
    <NumberField
      value={f.state.value}
      onChange={f.handleChange}
    />
  )}
</form.Field>