Hi Suwandi,
First of i want to know is your business scenario support "Synchronous" mean you send some input and get return some result ? if 'Yes' then goes to " Synchronous" Mode in Service interface .
Second what is your PI version 7.0, 7.1 etc...?
"messaging.synMessageRemove.removeBodyàtrue = true " with the help of PI Basis Team you can check if it false then change into true and restart PI Server .
is it SOAP to RFC Scenario?
Regard's
Smruti