File "BMK_test_problems.pdf" gives description of biobjective multidimensional knapsack problems, built from singleobjective multidimensional knapsack problems taken from Beasley OR Library, and converted to LP format suitable for e.g. CPLEX solver. 

All the BMK problems in their current form represent the case where y*1 = sum of all coefficients of the first objective function, y*2 = sum of all coefficients of the second objective function (they are equal as the coefficients of the second objective function are a perturbation of the first objective function), rho = 0.001 and lambda1 = lambda2 = 0.5. To prepare the problems for other values of ro and lambda the coefficients in the first and the second constraints have to be adjusted as desribed in the file "BMK_test_problems.pdf".

File "Calculator.xlsx" provides folmulas for  calculating constraint coefficients for given values of ro and lambda.