upper bound for integer variables: bound conflict

GAMS
1

Dear all

I have a MIP problem which some of its integer variables are restricted to 100 ( default upper bound for integer variables), when gams report the solution. The point is, when I try to change the upper bound ( I use .up attribute), it gives me error: the bound conflict!!

Any suggestion would be highly valuable for me.

Cheers,

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Babak Saleck Pay
M.Sc
Socio-Economic System Engineering
Group of Industrial Engineering
University of Tehran
Tehran,Iran

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2

Maybe this changes writing Option … = number; I do not exactly, see gams tutorial

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