Select data from sap tables FKKINV_KO
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FKKINV_KO - Invoicing: Header Data for FI-CA Document (FKKKO)
FKKINV_KOMV_DESCR_PRNT - Print Structure Invoicing: Pricing Text
FKKINV_KOMV_PRNT - Print Structure Invoicing: Pricing Text
FKKINV_KO_GFN - GFN structure of FKKINV_KO
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