How to obtain the marginal of equality constraints in nlp

GAMS
1

I used the CONOPT solver for calculating nlp, but the results showed that the marginal of the equationsis either 0 or EPS.Someone told me that CONOPT does not provide marginal values ,so what should I do to obtain the marginal of equality/inequality constraints?
Besides,I used the IPOPT solver, which can obtain the marginal values of equations and variables, but this result is not optimistic when used throughout the entire system.

2

Conopt delivers fine marginals. Nothing wrong with 0 or EPS marginals. If you want more detailed information, you might want to share your model.

-Michael