The problem of security in the Lotus WSDL was fixed thanks to some of the links below and the changes we did on the server configuration.
With it, this technical risk of the project is mitigated, now we have to go to the next one.
These kind of risks cause usually delay in the project if they are not treated properly. In this case, as I have been involved in the project from the initiation and I was able to get some time/resources to work on it, we are making advances.
Finally, other interesting factor has been that the resolution of this issue has been done without the typical pressure when you are on the project and even it has taken less time than estimated.