Scripts Errors Question:

How many profit center can we assign to material master?

Only One

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My 1st friend gave me 1000 and 2nd gave me 500 i have loos 1000 rupees then i purchase some thing with the cost of 300 and gave 100 100 both friends 1st friend remaining 900 and 2nd remaining 400 900+400+300=1600 why?	What is the IIS, and why we use it?