SAP ABAP Class Method CL_FKKINV_BILLCUST - EXISTS_SEPARATE_INV (Customizing Buffer for Billing Document) is used by

• Class (3)

#	Object Type	Object Name	Object Description	Package	Structure Package	Software Component
1	Class	CL_FMCAINV_BAPIBILL Method: CHECK_HEADERS	Transfer External Billing Document	FMCA_INV	IS-PS-CA	IS-PS-CA
2	Class	CL_INV_BAPIBILL Method: CHECK_HEADERS	Class for Billing document create	FSCR_INV	FI-CAX	FI-CAX
3	Class	CL_ISTINV_BAPIBILL Method: CHECK_HEADERS	Copy External Billing Document	IS_T_INV	IS-T	IS-UT