<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;">Hello Priyanki,</div><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><br></div><div>please find attached a CMPL file that should solve your problem. The problem was that your with the first proposal all language and plane constraints have to be fulfilled for an valid crew assignment. This forces your model to be infeasible. But if only one of the constraints (for both groups … language and plane) is satisfied a crew assignment is valid. Therefore I determine the valid crew combination due to the language and plane skills in the parameter section and use the corresponding parameter arrays valid_lan_combination[i,j,k] and valid_lan_combination[i,j,m] within the changed constraint con1. Additionally I calculate the max scores for each valid crew and use it in the objective function.<div><br></div><div>The second problem was your formulations of the weak SOS 1. Please take a look of the reformulated constraint con2.</div><div><br></div><div></div></div></div></div></div></div></div></div></body></html>