Approvals Dynamic SQL query using database query is giving XPATH error.

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I am trying to extend the dynamic SQL Approval queries for AP Invoices. I tried to pass 2 below BPM task attributes as Invoice Id field.

/task:task/task:payload/ns2:getInvoiceHeader1Response/ns2:result/ns1:InvoiceId
/task:task/task:payload/ns2:findInvoiceHeader1Response/ns2:result/ns1:Value/ns1:InvoiceId

 

After, I submitted the Invoice for Approval, its giving me below error (sample for one of above attribute).. 

 

Can someone validate if I am missing anything in XPATH expression. FYI.. related SQL query is giving me Approver name.

 

oracle.bpel.services.workflow.task.impl.RoutingSlipEvaluationException: oracle.bpel.services.workflow.task.impl.RoutingSlipEvaluationException: oracle.bpel.services.workflow.task.impl.RoutingSlipEvaluationException: ORABPEL-09500 XPath expression failed to execute. An error occurs while processing the XPath expression; the expression is orcl:query-database(concat('select LISTAGG(input_value_constant10, '', '') WITHIN GROUP(ORDER BY INPUT_VALUE_CONSTANT9) approverslist from FUSION.AP_INVOICES_ALL AIA, FUSION.AP_INVOICE_LINES_ALL AILA, FUSION.AP_INVOICE_DISTRIBUTIONS_ALL AIDA, FUSION.GL_CODE_COMBINATIONS GCC, FUSION.XLA_MAPPING_SET_VALUES VS WHERE AIA.INVOICE_ID = AILA.INVOICE_ID AND AILA.INVOICE_ID = AIDA.INVOICE_ID AND AIA.INVOICE_ID = AIDA.INVOICE_ID AND AILA.LINE_NUMBER = AIDA.INVOICE_LINE_NUMBER AND GCC.CODE_COMBINATION_ID = AIDA.DIST_CODE_COMBINATION_ID AND AIA.INVOICE_ID = ',/task:task/task:payload/ns2:getInvoiceHeader1Response/ns2:result/ns1:InvoiceId,' AND VS.MAPPING_SET_CODE like ''PWC_INV_DYNAMIC_APPROVERS'' AND NVL(AIA.ATTRIBUTE1,''NULL'') = NVL(VS.INPUT_VALUE_CONSTANT1,''NULL'') AND GCC.SEGMENT4 BETWEEN NVL(VS.INPUT_VALUE_CONSTANT2,''NULL'') AND NVL(VS.INPUT_VALUE_CONSTANT3,''NULL'') AND NVL(AIA.ATTRIBUTE2,''NULL'') BETWEEN NVL(VS.INPUT_VALUE_CONSTANT4,''NULL'') AND NVL(VS.INPUT_VALUE_CONSTANT5,''NULL'') AND AIA.INVOICE_AMOUNT BETWEEN VS.INPUT_VALUE_CONSTANT6 AND VS.INPUT_VALUE_CONSTANT7 AND AIA.INVOICE_ID =',/task:task/task:payload/ns2:getInvoiceHeader1Response/ns2:result/ns1:InvoiceId) ,true(),true(),'jdbc/ApplicationDBDS'). The XPath expression failed to execute;