UDF Activation Problem after migration - RFC LookUp

Hello Experts,

After Migration from XI 3.0 to PI 7.5 I am facing a problem with a UDF RFC LookUp. The error is

• error: incompatible types: com.sap.aii.mappingtool.tf7.rt.Container cannot be converted to com.sap.aii.mappingtool.tf3.rt.Container

in line

• dlp.setContainer(container);

I can understand the error but i have not found a workaround. I don't want to change to graphical RFC LookUp cause there is an extremely complicated scenario implemented and i don't want to change many things.

Thank you in advance