forEach not working in ICS while counting BI XML Output.

Summary

I am calling a BI Report from ICS and its returning a simple XML, However when I am trying to count the repeating node within the Output XML its unable to count.

Content

The BI Report which I am calling from ICS is returning below response .

  <DATA_DS xmlns="">
    <G_1>
      <INVOICE_ID>1234359</INVOICE_ID>
      <INVOICE_NUM>12342405</INVOICE_NUM>
      <VENDOR_NAME>B1, LLC</VENDOR_NAME>
      <BU_NAME>BS BU</BU_NAME>
    </G_1>
    <G_1>
      <INVOICE_ID>1234561</INVOICE_ID>
      <INVOICE_NUM>12340A</INVOICE_NUM>
      <VENDOR_NAME>B2, LLC</VENDOR_NAME>
      <BU_NAME>BS BU</BU_NAME>
    </G_1>
    <G_1>
      <INVOICE_ID>1234562356736</INVOICE_ID>