Originally posted by: xspeng

i have defined the 

dvar int+ Inv1[Plants][Products][DemandScenarios][0..NbPeriods];
dvar int+ Inv2[DCs][Products][DemandScenarios][0..NbPeriods];

but in the result the inv2 is negative in some period。

in addition

all，dvar boolean Order1[Plants][Plants][Products][DemandScenarios][Periods] and
dvar boolean Order2[Plants][DCs][Products][DemandScenarios][Periods]  are one

dvar boolean Order3[DCs][DCs][Products][DemandScenarios][Periods];
dvar boolean Order4[DCs][Retailers][Products][DemandScenarios][Periods];，but the 

dvar int+ OrderQuantity1[Plants][Plants][Products][DemandScenarios][Periods];
dvar int+ OrderQuantity2[Plants][DCs][Products][DemandScenarios][Periods];
dvar int+ OrderQuantity3[DCs][DCs][Products][DemandScenarios][Periods];
dvar int+ OrderQuantity4[DCs][Retailers][Products][DemandScenarios][Periods] is 0 in some  period

the .mod  should have some errors,

but i can not fix these errors 

i attach my .mod and data file

I hope you can help to solve the problems
Thank you so much for your help in advan

Hi,

you get a relaxed solotion because yor model is not feasible.

what you could do is add a settings file (.ops) in order to change the relaxation level

You should maybe watch

https://www.youtube.com/watch?v=tUALbhJ2xWY

and read a bit more

Tactics for diagnosing infeasibility in mathematical programming models solved by CPLEX.

http://www-01.ibm.com/support/docview.wss?uid=swg21400004

regards