How to pass parameter to SOAP request in SOAPUI - soap

Question

I'm newbie to soap and soapui, I'm trying to create a test case in which I will send the same request(XML attachment) many times(about 500), the problem is that each time I need to increment/change a value in the request (the id).
Therefore, I wonder if the is a way to pass this parameter to the attached xml file ? or if there is another ways to do the test case.
Thank you in advance
UPDATE
here is the content of the xml file :
<mod:sendMSG xmlns:mod="http://test.soap/service/model">
<id>${#Project#parameter1}</id>
<date>2016-04-03T04:03:00</date>
<infos>
<firstName>AT </firstName>
<lastName>AT </lastName>
......
</infos>
</mod:sendMSG>
which is included in the soap request, ass shown in the following image :

Answer 1

Test steps:
Groovy Script
SOAP Request (disabled)
I disabled the SOAP Request because it runs once more after the script has already looped the request x times.
Groovy script:
int loops = 500;
for ( iter in 1..loops ) {
//Overwrite the 'parameter1' property at project level
testRunner.testCase.testSuite.project.setPropertyValue("parameter1", iter.toString())
//log.info("iter: " + testRunner.testCase.testSuite.project.getPropertyValue("parameter1"));
// Run the teststep named 'SOAP Request'
def testStep = testRunner.testCase.testSteps['SOAP Request'];
testStep.run( testRunner, context )
}
Now you should be able to run your TestCase. I recommend saving your project before, I had some problems with SoapUI crashing on me when running.