This true for all analysis packages. Remember - simulation is just a simulation - it is NOT reality.
As far as using Cosmos to "prove" anything and its acceptance as an approved software....I don't want to give a wrong answer. It is true that some authorities say "we have approved such and such a software" but that does not usually mean that other softwares are not OK.
Most of the time, it is just like in the CAD world - the authority doing the certification has NASTRAN or something else in use, and therefore wants everyone else to use it as well, sometimes the reason is as simple as the fact that the person doing the approvals is an expirienced user of a particular software, so they are more comfortable taking results from this software.
In any case - before going out to buy some expensive software, have a talk with the people doing the approving. Perhaps you can get some kind of idea if they would be willing to accept results from another system...maybe not....
I often get asked if Cosmos can calculate pressure vessels according to EU Norm number 55 or something like that. Its important to realize that (as far as I am aware) there is no software with an "EU Norm 55" button in it. The norm most often describes what type of analysis must be done, what the loads are that must be withstood, and often also how the results must be presented. Often they even contain formulas and simplifications that try to approximate things that happen in the model that are actually much more complicated in reality than the formulas show. This is because some norms were designed before analysis was even possible. Quite often, these kinds of norms provide results that even the simplest analysis tools can beat! - But - since that is the norm, we still have to do it the old way. Sometimes - analysis tools cannot help fulfill the norm in any way at all, because of this.
Sooooooo - Talk to the people doing the approving. Remember - all finite element codes do the same thing (generally) and in general, what one can do, the others can too - so see if you can convince the people that really, any software could do it, as long as its used correctly. Good luck.
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