Dears;

Happy new year; 
I want to develop a Flowshop  scheduling using OPL  (on Cplex 12.10) 
When I run the model, it doesn't work and shows many errors. ( i think it comes from the perecedence variable Y[job][ops][job][ops][mch] and the conversion of duedates ); Can you please help me find what am I doing wrong here? Please have a look in the model, any possible solutions would be a great . 

my model, and data file are attached bellow.

Thank you.

------------------------------
So jana
------------------------------

#DecisionOptimization

Hello,
If you want to develop a Flowshop scheduling using OPL, it is more appropriate to use the scheduling features of OPL.
Some advice was given to you in the other thread, we hope they help you.
Nevertheless, in case you really want to try using MIP, feel free to continue here.
Regards,

------------------------------
Christiane Bracchi
------------------------------