SAP PI - Web Service - Function Module Export Table

Hi,

I was wondering if someone can help.

I am trying to return a table from a rfc of a function module. However, I want to return that table as an export parameter. The result is returned as a table if I run the function module locally. But if I run it through PI web service nothing comes back. I need to do this because the tables parameter is treated as a changing data type when calling the c#. And it expects me to know the number of elements returned, which means I have an error. Any help would be really appreciated.

If I call it from the RFC, I get results.

If I call the same from soapui, I get nothing.

Best regards,

Seamus