We realized that there is a bug in inp-par.F.
After line 1370 [S(ibry,ifield,igrid)%Chapman = .TRUE.]
the code missed the line [S(ibry,ifield,igrid)%acquire = .TRUE.].
bug _ CHAPMAN boundary condition
Re: bug _ CHAPMAN boundary condition
If you look at the Chapman condition, it does not require external values. Why do you think it should set the Acquire to true?
Re: bug _ CHAPMAN boundary condition
when we tried to use ANA_FSOBC, we could not get the defined SSH in with CHAPMAN. After setting the acquire to true it worked.