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Create screen control
In order to define the OK CODE you must fist declare a variable of type SY-UCOM and then insert this
variable into the OK code declaration within the element list (see screen shot below). If you have used
the code contained on the iwebsite the ok code should already have been declared as OK_CODE.
i.e. OK_CODE like sy-ucom.
Note: there is also a variable called SAVE_OK, it is good practice to store the returned ok code into
a work area as soon as you enter the PAI processing.
