Call Inbound Proxy Error

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There are unprocessed XML messages in the ERP which found to have error (Call Inbound Proxy Error). Here's the XML message from the XML Message Monitoring (SXMB_MONI):

http://sap.com/xi/XI/Message/30"

xmlns:SAP="http://schemas.xmlsoap.org/soap/envelope"

SOAP:mustUnderstand="">

<SAP:Category>XIProxy</SAP:Category>

<SAP:Code area="ABAP">DYNAMIC_CALL_FAILURE</SAP:Code>

<SAP:P1>UNCAUGHT_EXCEPTION</SAP:P1>

<SAP:P2>ZCL_GOODS_ISSUE_NON_SERIALIZED</SAP:P2>

<SAP:P3>EXECUTE_ASYNCHRONOUS</SAP:P3>

<SAP:P4/>

<SAP:AdditionalText/>

<SAP:ApplicationFaultMessage namespace=""/>

<SAP:Stack>Error during proxy processing An exception with the type

CX_SY_OPEN_SQL_DB occurred, but was neither handled locally, nor declared

in a RAISING clause The database returned a value containing an

error</SAP:Stack>

</SAP:Retry>M</SAP:Retry>

</SAP:Error>

Additional details:

No queue stuck found (SMQ1 and SMQ2) both in ERP and XI systems.

In XI system, no XML messages error/s found thus the error lies only in ERP.

Upon restarting the XML message containing an error in ERP, the payload has been suceesfully processed.

What's the cause of such error? How to eliminate such instance of having that error?