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Hi all, My question is just as the title said, What's the difference between = and ?= in ABAP keywords?

Thanks in advance.

+1  A: 

Special assignment operator ( ?=) for assignments between reference variables, whose assignability is checked as early as the runtime starts.

http://help.sap.com/abapdocu_70/en/ABENCASTING_OPERATOR_GLOSRY.htm

SteD
Note that it is mainly used to cast different types of reference variables. When assigning between the same type of reference variable you can still use =
Esti