For any SAP consultant or power user, a good understanding of the SAP database table structure and underlying relationship is valuable. When looking for documents, I often find myself navigating to SE16n to review table contents rather than other list transactions. These also come in handy when constructing SQVI queries:
Hey, now that you have found your tables, check out my article on how to be an expert table browser using SE16N.
| Table | Description | Area | Comment | 
| KNMT | Cust-Mat’l Inforecord | Master Data | Customer-Material Inforecord information. Customer Material Numbers, descriptions, UoM’s, etc. | 
| KNA1 | Customer Master (General) | Customer | General customer information including address | 
| KNVV | Customer Master (Sales) | Customer | Customer master sales information by Sales Area. | 
| KNA1VV | Customer Master (General/Sales) | Customer | This is a convenient joined table containing both General and Sales information. | 
| LIKP | SD Document: Delivery Header Data | Delivery | Delivery header data | 
| LIPS | SD document: Delivery: Item data | Delivery | Delivery item data | 
| MARA | General Material Data | Material Master | Material Master general data (Basic Data views) | 
| MARC | Plant data for material | Material Master | Material Master plant data | 
| MVKE | Sales data for material | Material Master | Material Master Sales data (Sales Org 1, 2 and others) | 
| VBAK | Sales Document: Header | Sales Documents | Sales Document header data | 
| VBAP | Sales Document: Item | Sales Documents | Sales Document line item data | 
| VBEH | Schedule Line History | Sales Documents | Sales Document Schedule Line history | 
| VBEP | Sales Doc: Schedule Lines | Sales Documents | Sales Document Schedule Line data | 
| VBFA | Sales Document Flow | Sales Documents | Document flow table – you can search for preceding and subsequent documents. Document category is a handy filtering tool for large flows. | 
| VBKD | Sales Document: Business Data | Sales Documents | Additional Sales Document header values such as incoterms and PO information | 
| VBPA | Sales Document: Partner | General | Sales Document Partner assignments | 
| VBRK | Bill. Doc: Header Data | Billing Documents | Billing Document Header data | 
| VBRP | Bill. Doc: Item Data | Billing Documents | Billing Document Item data | 
| VBUK | Sales Doc: Header Status | General | Sales Document Header Status – Helpful for troubleshooting billing and completion issues. | 
| VBUP | Sales Doc: Item Status | General | Sales Document Item Status – Helpful for troubleshooting billing and completion issues. | 
| MARD | Storage Location Data for Material | Inventory | Inventory Levels by material, plant, and storage location. | 
| MSKA | Sales Order Stock | Inventory | Inventory Levels by material, plant, storage location, batch, and Sales Document / Item. | 
| VCRSELA | Cross Selling Analysis | Cross Selling | Table which stores Sales Documents used in Cross Selling Analysis (Program SDCRSL01). | 
| VCRSELA_RES | Cross Selling Analysis: Results | Cross Selling | Table which stores Cross-sold material pairs used during dynamic proposal of cross selling in VA01. | 
| FPLA | Billing Plan | Billing | Table which stores Billing Plan header information along with the assignment to the SD object. | 
| FPLT | Billing Plan Dates | Billing | Table which stores individual Billing Plan date records. Credit Card transactions are also stored here. | 

 
                         
                         
                         
                         
                        
http://www.saptables.co.uk – also a useful resource
VBKD should be on the list eh?
Added. Thanks!