# [Moved]: Problem with periodic boundary condition in CST

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#### alsh699300

##### Newbie level 3
Hi every one
I have a problem with periodic boundary condition in CST software.
I have a cylinder with two layer coating which is infinite along z axis
I used periodic boundary condition for z
This warning occured:
Inhomogeneous material at periodic boundary detected. Farfield results may be inaccurate. (The structure must be identical in the periodic boundary plane and the next two mesh steps.)
Location(s): zmin zmax
What should I do? Does it mean that I can't use PBC for my structure?

#### redcrystalline

##### Advanced Member level 4
hi
please upload ur project.

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