How can I access Unformatted Post Data in ASM

you can check your parameter wildcard configuration at * from the following path Security ›› Application Security : Parameters : Parameters List ›› Parameter Properties

without more specific details it is difficult to diagnose cause

if you click down into the violation you will see the exact place the violation occurs in the request. this might give a better clue as to what is happening

also may consider other areas, for example, sometimes encoding differences can cause character issues