Lattice intersection

[Mak Trifkovic <mak@math.mcgill.ca>]

I have a number field F and I want to intersect an ideal I of O_F with an 
order O.  The manual claims that I can use idealintersect to get an 
intersection of any two Z-modules, but the command seems to convert a 
lattice to the ideal it generates.

E.g., if F=Q(y) is a quadratic NF, idealintersect(F,[1,0;0,3],[1,0;0,3]) 
yields [1,0;0,1], which means that takes [1,0;0,3] to be the ideal 
generated  by 1 and 3y, and not the order Z[3y]?

Am I using this the wrong way?  Is there another way to intersect 
lattices in number fields?

Thanks,

Mak