#682 the '+' is deleted unexpected in the response json

[jhuang]

I am using the soapui 5.2. my response is a json, but inside, it contains a character '+'.

for example. my response should be like below
{"op":"core/text-transform","description":"[Remove Characters Before 'formation)'] [CutBefore]","engineConfig":{"facets":[],"mode":"row-based"},"columnName":"CutBefore","expression":"grel:trim(if(isBlank(partition(value, 'formation)')[1]), value, partition(value, 'formation)')[1] + partition(value, 'formation)')[2]))","onError":"keep-original","repeat":false,"repeatCount":10}}

however, the response show up in soapui that the '+' is missing. like below at expression
"expression": "grel:trim(if(isBlank(partition(value, 'formation)')[1]), value, partition(value, 'formation)')[1] partition(value, 'formation)')[2]))",

why the '+' is missing? I tried with fiddler and see actually the server give the response correctly as the '+' inside. the problem is soapui delete it automatically.
this made my next test fail.Does anyone meet this problem? is there any solution? thanks for help