SOAP response not returning key field sent

Hi,

I am using CPI for development here.

I am receiving data from odata and splitting it and sending 1 by 1 to 3rd party, the key field is employeeid. 3rd party is returning response but they are not returning employeeid which we have sent them.

How to store employeeid for every request so that when SOAP response comes i know the response was for which employee.

Regards