Simulation of composites


We purchased a simulation package from a known name to calculate composite structures and parts. The results given by the simulation didn't line up with the logical expected results. So I got in contact with our technical support. Well, I received the answer that the software isn't able to calculate a woven material. But I was suggested to use 2 layers of uni (0 and 90 degrees) to imitate the woven material.
I don't think this will give me a realistic result. Because this means the resin between layers and the woven interaction in a e.g. twill will be equally treated in the software. I hope that makes sense...
Does anybody have any experience with that? Or can anybody tell me if I am totally lost on the wrong track with my logic.
I appreciate any help. Thanks in advance,

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