Modify railings paths inside groups

Hello guys,

We want to modify railings inside groups

We are using the worflow discussed in this previous post

The definition seems to complete but the set railing path seems not to respond and I am not sure why???

Please see the graph attached and rvt files

Many thanks

Modify railing paths in groups.dyn (151.9 KB)

Railings.rvt (3.4 MB)

Hello dynamo gurus,
Any ideas why this graph isnt working???
Many thanks in advance