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我有两条消息，第一条消息如下。应该匹配的元素是root/items/data/subscription_id

<?xml version="1.0" encoding="UTF-8"?>
<root>
    <id>AX8a8aa</id>
    <type>invoice</type>
    <billing_document_number>FRIN218</billing_document_number>
    <state>open</state>
    <account>
        <account_number>X00204</account_number>
        <custom_fields>
            <Country__c>France</Country__c>
            <Entity__c>Local Subsidiary</Entity__c>
        </custom_fields>
    </account>
    <items>
        <data>
            <amount>1161</amount>
            <service_end>2023-05-31</service_end>
            <service_start>2022-06-01</service_start>
            <subscription_id>8a8aa</subscription_id>
            <taxation_items>
                <tax_rate_name>TVA</tax_rate_name>
            </taxation_items>
        </data>
        <data>
            <amount>-104.25</amount>
            <service_end>2022-06-30</service_end>
            <service_start>2022-06-01</service_start>
            <subscription_id>8a8aa</subscription_id>
            <taxation_items>
                <tax_rate_name>TVA</tax_rate_name>
            </taxation_items>
        </data>
        <data>
            <amount>-104.25</amount>
            <service_end>2022-09-30</service_end>
            <service_start>2022-09-01</service_start>
            <subscription_id>91abd</subscription_id>
            <taxation_items>
                <tax_rate_name>TVA</tax_rate_name>
            </taxation_items>
        </data>
    </items>
</root>

第二条消息如下所示;它提供了关于订阅的更多细节。

<?xml version="1.0" encoding="UTF-8"?>
<root>
   <id>8a8aa</id>
   <notes>test 1</notes>
   <CUP__c/>
</root>

我需要根据消息1合并两个有效负载：根目录-〉项目-〉数据-〉订阅标识=消息2：根-〉id
预期输出应如下所示：

<?xml version="1.0" encoding="UTF-8"?>
<root>
    <id>AX8a8aa</id>
    <type>invoice</type>
    <billing_document_number>FRIN218</billing_document_number>
    <state>open</state>
    <account>
        <account_number>X00204</account_number>
        <custom_fields>
            <Country__c>France</Country__c>
            <Entity__c>Local Subsidiary</Entity__c>
            <SAP_ReceiverInternalID__c/>
        </custom_fields>
    </account>
    <items>
        <data>
            <amount>1161</amount>
            <service_end>2023-05-31</service_end>
            <service_start>2022-06-01</service_start>
            <subscription_id>8a8aa</subscription_id>
            <taxation_items>
                <tax_rate_name>TVA</tax_rate_name>
            </taxation_items>

            <id>8a8aa</id>
            <CUP__c/>
            <notes>test 1</notes>

        </data>

    </items>
</root>