references lost

[Lokki7]

Hi,

a strange thing happened to me.

I have 3 tables
Projects
Jobs
Users
Users is a child of jobs which is a child of projects.
I generate a final pdf and everything works fine.
I changed the data type for the ref column in the Users table from ref to text by mistake. I reset it to ref, but since then the pdf does not work and I find this error Start expression '[Users]' should generate a List of Ref values.

I have tried everything, delete and recreat the users table, delete the virtual Related Users column in the jobs table, but nothing.
As proof I tried changing the data type for the ref column in the jobs table, and when I generate the pdf it gives me the error Start expression '[Jobs]' should generate a List of Ref values.

Can anyone help me?

[JuneCorpuz · Accepted solution]

Can you please send a screenshot of your data structure and the pdf template?

[Lokki7]

Thanks for your answer, 
your question helped me to find the solution. The related column name  was wrong.