I am trying to specify some constraints for an fmm model. I run the model, I get no errors, but the reported coefficients do not satisfy the constraints.

Can someone please advise, thank you. Note I have seen the same question asked here before but it had no answer.



Example:

Code:
sysuse auto, clear
constraint define 1 _b[mpg:1.Class#c.weight]<-.01
constraint define 2 _b[mpg:2.Class#c.weight]<-.01

fmm 2: regress mpg weight 
fmm 2 , constraints(1 2): regress mpg weight     // no change in coefficients