SAP Function Module search on FKKIN
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FKKINV_BILLDOC_ADJUST - Adjust Billing Document
FKKINV_BILLDOC_CREATE - Create Billing Document
FKKINV_BILLDOC_REVERSE - Reverse Billing Document
FKKINV_EVENT_2645_XX_GEN - INV: Doc. References, External ODN, Suppress ODN in Invoicing Document
FKKINV_EVENT_2658_XX_GEN - Event 2658 - Sub-ID Determination for ODN
FKKINV_EVENT_2667_XX_GEN - Event 2667 - Sub-ID Determination for ODN for Reversal
FKKINV_EVENT_SAMPLE_2603_XX - Deactivate ODN invoicing function for special source doc. type and country
FKKINV_EVENT_SAMPLE_2665_XX - Change correction category of tax invoice trigger in case of reversal
FKKINV_EVENT_SAMPLE_2737_XX - Change source document type of tax invoice trigger in case of reversal
FKKINV_GET_GLOBAL_DATA_2658 - GET global data set in FKKINV_EVENT_2658_XX_GEN
FKKINV_INVDOC_DISP_BY_REFOBJ - Display Invoice by Reference Object
FKKINV_ODN_PROC_SA - Enable ODN by API Determination
FKKINV_ODN_SUBID_SIM - Execute SUBID Simulator with Invoicing Document
FKKINV_ODN_SUBID_SIM_SHOW - Show Result of Sub-ID Simulation
FKKINV_SD_IS_FKART_ACTIVE - SD/CI/FICA without eDocument in S4H OP
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