Copying an Internal Table into another Internal Table:
If you want to copy the entire contents of one internal table into another in one execution, use the MOVE statement or the assignment operator (=) as follows:
Syntax
MOVE <itab1> TO <itab2>.
This statement is equivalent to:
<itab2> = <itab1>.
Note : above syntax  works only if ITAB2 is Empty
For example if ITAB2 having records at that time we have to use APPEND LINES OF
Syntax :
APPEND LINES OF itab1 TO itab2.
 
 
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