Problem in defining filter expression

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Problem in defining filter expression

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Hi,

 

I'm trying to use filter expressions while creating a trigger point for a business event. For this, I need to specify a filter expression(check whether eventPoint = APPROVE) while defining the business event. I tried using 

<xpathExpr xmlns:s='http://xmlns.oracle.com/apps/projects/billing/workarea/invoice/InvoiceEvent'>/s:InvoiceEventInfo/s:eventPoint = 'APPROVE'</xpathExpr> as the filter expression. But its returning false.

 

The payload passed is:-

 

<InvoiceEventInfo xmlns="http://xmlns.oracle.com/apps/projects/billing/workarea/invoice/InvoiceEvent">

  <invoiceId>123445678</invoiceId>

  <contractNumber></contractNumber>

  <eventPoint>APPROVE</eventPoint>

  </InvoiceEventInfo>

 

I tried searching but couldn't find a proper documentation for the same. Please guide where I'm going wrong.