I have renamed my FM to ZIDOC_FROM_E2E_ASYN and generated a wsdl again.
The strange this is that i invoke a standard FM of SAP which is called IDOC_INBOUND_SINGLE. When i generate a WSDL of this standard FM and import it into my model it seems to be missing the tables parameter ? it only has the import and export parameters.
Attached is a screenshot of the FM and the imported wsdl.