function, dnlp error

GAMS
1

i want to run,

depodan1(k)…sum(j (ord(j) ne 1 ) ,x("1",j,k)) =e=sign(sum((ij), t_karsila(k,ij))); depodan2(k)..sum(i (ord(i) ne 1 ) ,x(i,“1”,k)) =e=sign(sum((ij),
t_karsila(k,ij)));
it says,endogeneous function arguments not allowed in linear models

i also try it in if else statement, then it says,dnlp model type.
what can i do?

\

2

Try MINLP when running your algorithm.

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