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In this function module, customer-specific object data is formatted for display on the rate category screen. Normally, all you have to do is copy the field values from your object structure into the screen structure. In individual cases you can format the data more specifically.
The screen data is temporarily stored in a global structure in the object program so that it is available when the customer subscreen is is subsequently called up for PBO. This (and the corresponding PAI call) are the only exceptions where object-related data is not allowed to be stored in the object program. This is necessary because the CALL SUBSCREEN statement does not allow you to transfer parameters.
As well as being saved in the object program, the screen data is also returned to the calling function. the function module documentation