SAP Function RS_DME_CUS_CHECK_VDNR_EXISTS - Check if given vendor already exists on the DB

Parameter	Reference	Type	Length	Default	Optional	Text
I_VENDOR_NAME	CHAR40	C	40			Vendor Name

Parameter	Reference	Type	Length	Text
E_EXISTS	RSDMEM_BOOLEAN	C	1	Boolean ( 'X' or ' ' )