What is the disadvantage with views in generic extraction?

what is the disadvantage with views in generic extraction?
thanks in advance,

Hi ,
<i>What is disadvantage of generic extraction ? </i>
If i am asking this what you will say ......You have only less points to say if any one ask you like this .
Similarly Generic extraction based on view has many advantegs It was given to extrct data when standard business content data source is not available .
But we know Views can be created when the table you need to extract data has Primary Foreign key relation .So if you need to extarct data from many tables with no relation between them then you cannot use view .
But if you need to extract data from tables that have complex relation ,Then you need to go for Function Module extration and write some ABAP code and using SQL ststements you fetch data from tables based on thier key fields and finally get the desired data by your coding logic .

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