Difference between bex user exit and macros in functionality?

Hi all,

I need to create a report on material master data. I created an infoset on 0material and 0mat_plant. In the requirem

ent, I have a report containing different material numbers followed by attributes in each row. the final column in each

row should be calculated using logic. the logic involves comparing different row values and arrive at final conclusion.

the logic comprises of large number of if conditions. so should i use bex user exit or excel macros?

what is the difference between user exit and macros in funcitonalilty?

is there an issue transporting the macro to Prod for end users to use?

any performance criteria?

Any how to documents ..will be of a lot of help

plz send them to aps804@yahoo.com

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ravi a