Hi Erik,
Thanks to your very useful tip, I have found that I somehow missed one of the dimensions for this account when I was loading the budget. That is why the field was showing as empty.
Apparently, copying the row did not copy any codes in the hidden columns, and that is why it was only showing up then.
I loaded the budget for the account with the missing dimensions included, and it’s working fine now.
That’s a lot, now I have another tool in my arsenal when I am troubleshooting something.