CustGroup – The CustGroup table contains a list of groups into
which customers can be added. Every customer must
specify a CustGroup with which it is associated.
VendGroup – The VendGroup table contains definitions of vendor
groups.
CustTable – The CustTable table contains the list of customers
for accounts receivable and customer relationship
management.
VendTable – The VendTable table contains vendors for accounts
payable.
SalesTable – The SalesTable table contains all sales order headers,
regardless of whether they have been posted or not.
PurchTable – The PurchTable table contains all purchase order
headers, regardless of whether they have been posted
or not.
SalesLine – The SalesLine table contains all sales order lines,
regardless of whether they have been posted or not.
PurchLine – The PurchLine table contains all purchase order lines,
regardless of whether they have been posted or not.
– Reference
http://www.winfosoft.com/blog/microsoft-dynamics-ax/microsoft-dynamics-ax-%E2%80%93-what-tables-compose-the-order-tables-in-dynamics-ax#sthash.QnSkRhYt.dpuf