public void setAccountId(String accountId) {
        this.accountId = accountId;
    }
<p>
The Amazon Web Services account in which this custom line item will be applied to.
</p>

@param accountId
       The Amazon Web Services account in which this custom line item will be applied to.
aws-java-sdk-billingconductor/src/main/java/com/amazonaws/services/billingconductor/model/CustomLineItemVersionListElement.java