[Scip] Upper bound on variables during pricing

[Hélène Toussaint]

Dear all,

I use SCIP to code a branch & price algorithm on positive continuous 
variables. I branch on instance data (using a constraint handler to 
store the branching decisions). When I modify the instance data some 
variables become forbidden (I fix their upper bound to 0).

I'd like SCIP to not set upper bound on the other variables. As 
explained in the FAQ I have marked all constraints containing priced 
variables as modifiable and added SCIPsetIntParam(scip, 
"propagating/rootredcost/freq", -1). But occasionally there is a 
variable with an upper bound equals to 0 although it isn't forbidden in 
the current node. How is this possible? Could you please help me with 
this issue?

Best regards,

Hélène

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