Passing XML to SOAP Execute Snap

I have XML generated in Previous snaps with all required SOAP headers and stored as a string(let say $xml). I am passing this to SOAP execute in Customize Envelope as $xml. I am getting error as below

Failure: Unexpected character ‘&’ (code 38) in prolog; expected ‘<’ at [row,col {unknown-source}]: [1,1], Reason: Snap failed unexpectedly and did not provide any reason

Please check and let me know if I am doing something wrong.

Thanks in Advance…!!

Figured it out…

Used #evaluate($xml) in Customize Envelope