Siemens Step 7 Analog scaling

Hello,
We monitor the temperature of a pipe via a 4-20mA temperature transducer. This goes into DB135(Read Analog Inputs). The issue I have is the transducer is slightly out of calibration I.E wAnalog_Value reading 87degrees and pipe is measuring 83degrees. In the Function block there is a entry rReplacement Value(currently zero). Is there a way to alter the rNormalized value ?
Any pointers would be of great help.

PLC Step 7 319-3

Thanks