E9.2 Business function B4210670 data structure


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I am trying to find out two returned fields from business function B4210670, szCreditMessage and szTempCreditMessage, I need to know how are these return values calculated, can some help me with this? tried to look into the business function but I think there are nested calls to other business functions, these values are returnrd to application tion P421007
any help would be appreciated