Add xml encoding tag to source payload

Hi Experts,

I need to add xml encoding line "<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>" to source payload.

message is failing at Message mapping as this encoding is missing in the source payload.

Can someone suggest what can be done.

I tried using Anonymizer bean module in sender adapter, but it didnt work.

Help is appreciated

Thanks

Sarada