Thanks Benedict, but I am confused with the step = 2 option got it from a link, which says as
I_STEP = 1 is used when ther is need of default value in input parameter. This parameter may or may not be INPUT type and mandatory or Optional and Processing type must be Customer Exit.
I_STEP = 2 is when there is need of calculating the value of variable by the value of another variable. The second variable Processing type Customer Exit, Not ready for input and mandatory.
In this case, step= 2 saying that it need to be calculated on the base of another value. but we dont have any base or any variable depending on it as user will not enter any doc type selection and we dont have any base as plant/year is the only input given by the user and none of these are dependent on doc type. In that case, technically it should be written in step = 1. Please advice. I am confused :
Thank You
DR