Reciprocal sale of flats one at vasundhra ghaziabad vs one at munirka delhi(dda)

Querist : Anonymous (Querist) 29 January 2012 This query is : Open
I have a flat at Vasundhra Gaziabad and want to exchange with owner who has flat at Muniraka DElhi(DDA).
Questions:
1) Is it possible to have a reciprocal sale deed citing difference in amount?
2)Where the sale deed(deds) ned to be registered?
3) At what stage posession will be transferred?
4) precautions while buying a dda flat?

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