Hello Avitej,
Checking the document Standard WWI processing methods (WWI), I´ve find the following function that might work for you: C14N_SYM_TEMP_TO_C
FUNCTION C14N_SYM_TEMP_TO_C.
*"----------------------------------------------------------------------
*"*"Lokale Schnittstelle:
*" IMPORTING
*" VALUE(I_SEL_CRIT) TYPE RCGLSYSELC OPTIONAL
*" VALUE(I_SYM_DEF) TYPE TCGA6 OPTIONAL
*" CHANGING
*" VALUE(X_RCGLSYVAL) TYPE RCGLSYVAL
*"----------------------------------------------------------------------
* Begin Correction 08.03.2011 1566397 **********************************
* WWI symbol method conversion:
* This method converts a value of dimension temperature
* to degrees celisius (°C).
* For example: from °F (Fahrenheit) to °C.