Creo 10 Flow Analysis cannot calculate with more than 3 domains.

In Creo 10 Flow Analysis, when I try to create a mesh for analysis with a model containing 3 or more domains, the meshes for some domains are not generated.
Also, the I/F between domains is not recognized.
In our previous use of Flow Analysis in Creo 7, a mesh was generated for all domains in a model with up to 7 domains and all inter-domain I/Fs were identified.
(We are not aware of the maximum allowable number of domains.)
Using this previous model used in Creo 7 Flow Analysis, or creating another new model, does not work in Creo 10 Flow Analysis.
Note that even in Creo 10's Flow Analysis, mesh generation and inter-domain I/F identification is still possible for up to two domains.
Is there any special way to handle equal or more than 3 domains in Creo 10 Flow Analysis?
thanks