Most Important Tables for SAP Sales and Distribution module

Customer

• KNA1 - General Data in Customer Master.

KNB1 - Customer Master (Company Code).

KNB4 - Customer Payment History.

KNB5 - Customer master (dunning data).

KNBK - Customer Master (Bank Details).KNKA - Customer master credit management: Central data.KNKK - Customer master credit management: Control area data.KNVA - Customer Master Unloading PointsKNVD - Customer master record sales request formKNVH - Customer HierarchiesKNVI - Customer Master Tax IndicatorKNVK - Customer Master Contact Partner.KNVL - Customer Master LicensesKNVP - Customer Master Partner Functions.KNVS - Customer Master Shipping DataKNVV - Customer Master Sales Data.
Other RelatedKLPA - Customer/Vendor Link
Sales DocumentsSales OrderVBAK - Sales Document - Header DataVBAP - Sales Document - Item DataVBKD - Sales Document - Business DataVBEP - Sales Document Schedule Line
DeliveryLIKP - Delivery Document Header dataLIPS - Delivery Document item data, includes referencing PO
ShippingVTTK - Shipment headerVTTP - Shipment itemVTTS - Stage in transportVTSP - Stage in transport per shipment itemVTPA - Shipment partnersVEKP - Handling Unit : Header TableVEPO - Packing: Handling Unit Item : Contents 
BillingVBRK - Billing Document HeaderVBRP - Billing Document Item
Other Related to all SD document types (Order/Delivery/Billing)PRCD_ELEMENTS - Pricing Elements (Only in S/4HANA)VBPA - Partners FunctionVBFA - Document FlowNAST - Output Message StatusNACH - Detailed output dataVBBE - Sales Requirements: Individual Records (Order and Delivery)VBUK - Header Status and Administrative DataVBUP - Item StatusT441V - Availability Check Control
MaterialMAKT - Material DescriptionsMARA - General Material DataMARC - Plant Data for MaterialMARD - Storage Location Data for MaterialMARM - Units of Measure for MaterialMBEW - Material ValuationMLAN - Tax Classification for MaterialMVKE - Sales Data for MaterialT134 - Material TypesT179 - Materials: Product Hierarchies
Enterprise StructureT001K - Valuation areaT001L - Storage LocationsT001W - Plants/BranchesT300 - WM Warehouse NumbersT320 - Assignment IM Storage Location to WM Warehouse NumberT499S - LocationTSPA - Organizational Unit: Sales DivisionsTVBUR - Organizational Unit: Sales OfficesTVBVK - Organizational Unit: Sales Groups per Sales OfficeTVKBZ - Org.Unit: Sales Office: Assignment to Organizational UnitTVKGR - Organizational Unit: Sales GroupsTVKO - Organizational Unit: Sales OrganizationsTVKWZ - Org.Unit: Allowed Plants per Sales OrganizationTVTA - Organizational Unit: Sales Area(s)TVTW - Organizational Unit: Distribution Channels