I am trying to: Have CPT's posts relationships.
I have posts post => CPT Città (or Comuni) => CPT Province => CPT Regioni => CPT Nazioni
well the issue I have is the relation between the old posts of CPT Città (or Comuni) to CPT Province. I cannot select the related parent CPT post... see the attached image.
But, if I create a new post in CPT Città I can select the related CPT Province post...
Link to a page where the issue can be seen:
AN old CPT Comune post where I have the issue: hidden link
A new CPT Comune post where all works fine: hidden link
I expected to select the related parent post in the old posts
Instead, I got: it is possible only for new posts...