Processing bulk data with soap

Hello I'm new to SoapUI and this forum.

I have a soap webservice which processes data of a user defined object as soap request over http. It works fine with a single object and also with two, three or ten objects, but I have an additional requirement to test the webservice with a dimension of 10000 objects without losing any of those objects.

I never faced such a task, so it would be helpful for me if someone could give me a hint to solve such a problem. Any URL or other step in the right direction is appreciated!

Kind regards,

Michael