RS00432: CPLEX DOESN'T APPLY CUTOFF VALUE TO MIP STARTS

IBM ILOG CPLEX Optimization Studio Academic Research Edition Fix Pack 12.2.0.2

APAR status

• Closed as program error.

Error description

• CPLEX currently accepts a MIP start whose objective is worse
  than the cutoff value.  While the MIP start is not calculated
  by the branch and bound algorithm, accepting it violates the
  meaning of the cutoff parameters:
  
  if the model does not contain a solution that is at least as
  good as the cutoff value, then the model should be declared
  infeasible.
  

Local fix

• One could address this with an incumbent callback function that
  implements the cutoff test directly.   But, that involves a
  nontrivial amount of work (and disables dynamic search) so
  we recommend upgrading to 12.2.0.1.
  

Problem summary

• Minor bug unlike to be an issue for any users.  But, CPLEX
  doesn't properly apply a non default cutoff value to a MIP
  start.
  

Problem conclusion

• Fixed in 12.2.0.1
  

Temporary fix

• No.
  

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Modules/Macros

• MIP
  

Fix information

• Fixed component name

  ILOG OPL-CPLEX

• Fixed component ID

  5724Y5400

Applicable component levels

• RC20 PSY

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