What is Legaccy System Migration Workbench? How it can be carried out in SAP SD? 

Retain -Specifies that retain should be invoked on the object upon assignment. takes ownership of an object

Assign - Specifies that the setter uses simple assignment. Uses on attribute of scalar type like float,int.

Various activities in SAP MM are : Inventory, Warehouse, Purchasing, Vendor evolution, Invoice varification, etc.

A scheduling agreement can be made for Consignment, Subcontracting and stock transfer. A contract, also known as a blanket PO, can be made for standard items and can be restricted to a Value or QTY.

Consignment stock is the material which is lying in the premises but is not owned by the company. It has no value assigned to it until it is taken into own stock. Once it is used in production or to be sold, it is taken into own stock.

Support tickets are basically the problems that arise in day to day usage of SAP. 

So any sap fico consultant who is resolving the day to day production issues is actually supporting the tickets.

In an Interactive Report, user can define maximum 20 secondary lists.

BDC ----> Batch Data Communication 

Methods of BDC-----> Direct Input method, Batch Input Session method, Call transaction method.

An Interactive report allows the user to participate in retrieving and present data at each level.while classical report doesn't have access to interact.