BISWAJIT KAR

Thank You! @..., for your kind help. I will try to implement this. It is working right now. Let's see if the problem converges. I will definitely let you know.    

Actually, this is a transportation problem... working through different layers of sources and destinations. it worked up to a particular node, but when the problem gets bigger, and variable numbers...

Thank You for your assistance Jaromił Najman. But the upper bound of the yij is not Pijt in the first place. If you look at inequality (1) of your last comment, then you can find that yij is divide...

Yes, Jaromił Najman Sure! So The variable in the denominator (tr ij )is an integer type xijt is a binary variable.  yij is again integer type.  The integers are to be controlled by the binary varia...