Internal Surface comes an error

I add an IS. It comes an error as following.
Error 1000: DES simulations do not support the
specified IS TYPE:
IS: 1
IS_TYPE=SEMIPERMEABLE

I have set that surface “bc_po_apply_to_des=False”
How to solve this error? I’m waiting for your reply.

RTC-CG.mfx (16.6 KB)
shikeyuan-RTC-3m.stl (33.9 KB)

Note, this is a duplicate of: Boundary condition settings fail to work which is now closed.