SAP ABAP
What have beed realised ZPFAF1
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ZTBL_COUNTRY, ZTBL_CITY, ZTBL_STREET - tables for data
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ZI_COUNTRY, ZI_CITY, ZI_STREET - Views from the tables how connected with foreign kes and assotioation
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ZPFAF1.ZPFAF1_RAP -
DAdi realisation for two interfaces ZIF_SUM and ZIF_MUL.
By the name of interface call the interface-specific function for sum or for mul.