Combine list of repeated items gives nulls

[lennart030]

i am trying to push an area parameter in the rooms in that area. the first part succeeded but now i get only null values when i am trying to combine the parameter to the room. doe anyone have an idea of what i am doing wrong? it

worked before.

[Kulkul]

Hi @lennart030

Try doing these changes in your graph:

Like this. Please note the lacings:

[lennart030]

thanks for the solution