Whats the meaning of 'reaction' !

in a SAP standard code i found a systax like
if reaction = 'A' then ,........
Whats the meaning of this ?

Well, basically, that is a conditional statement which is comparing the variable REACTION to the literal "A".  REACTION is a variable of some type in the parameter, and if its value is = "A", then the program will do some lines of code.
This could mean anything within the context of the program, this variable could be used to evaluate a variable from a function module which the user is giving some answer via a button, or anything.
Regards,
Rich Heilman

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