Call ABAP: object oriented patters
Part of the learning training Call ABAP: stable design code
1. ABAP2XLSX need to be imported into the system in initial namespace. https://github.com/sapmentors/abap2xlsx 1. https://github.com/OlegBash599/CallABAP_samples/wiki/Агрегирующие-функции-в-подзапросах-ABAP-SQL