SOA : XPATH BPEL4WS spec 1.1 section 14.3 Error

Some time we will be getting below error in BPEL flow for assign or transform activity.

<bpelFault><faultType>0</faultType><selectionFailure xmlns="http://schemas.xmlsoap.org/ws/2003/03/business-process/"><part name="summary"><summary>The &lt;from> value is invalid. The result of from-spec is null. Either the from node value or the xpath query in the from node value was invalid. According to BPEL4WS spec 1.1 section 14.3, the from node value should not be empty. Verify the from node value at line number no line in the BPEL source. </summary></part></selectionFailure></bpelFault>"

this can be happen either in assign or transform activity of BPEL flow. in order to avoid this error , assign dummy value to variable. This will be overwritten by the Assign activity in the next step anyways.

Happy codding :)