SAP Function Module search on KR_S
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KR_SAVE_CUSTOMER_VATNO - Passing customer data
KR_SAVE_VENDOR_INDUSTRY - To save vendor information
KR_SAVE_VENDOR_VATNO - Passing vendor data
KR_SET_CHANGE_VATNO - Mark change to update data updation
KR_SET_FCODE - Passing OK_CODE from the MAIN screen - User Action
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