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TilluTillu 

why lookup field is not commonly available for joineed reports ?

why  lookup  field is  not  commonly  available for  joineed reports ?  user lookup  unable  to  drag  and drop on  2  reports
SonamSonam (Salesforce Developers) 
If I understand your questions correctly: the Product Mnaagement's update will answer your question on this idea:
https://success.salesforce.com/ideaView?id=08730000000gPVNAA2