Validating a randomly generated name

Hello,

I am tottaly new to Soap UI. I got a task to make a project, that would create a test project in my Testlink. The test project should always have a different name, so that there would be no chance of deleting the previous one. My idea was to give the project the name TestProject# and the number would be randomly generated.

Like this:

TestProject#${=(int)(Math.random() * 90000 + 10000)}

the thing is that I have no knowledge of how to validate if the name already exists. The project I got requests it simply like this:

<member><name>testprojectname</name><value><string>${#Project#projectName}</string></value></member>

But this makes it generate the number again, so the name doesn't match and the validation obviously can't pass.
So the question is, how can I make the validation pass or if there is some different method that would generate the project name.

Thank you