How do you filter one assets custom field with another?

KC Wong_akqwi1

My original goal is much more complex, but since it's not working as I expect I'm now simplifying it to this:

1. customfield_12389 points to Assets schema (no filtering except objecttype = xxx). Single valued. 

2. customfield_12390 will limit its choices to what is selected in cusotmfield_12389.

I set 12390 to use filter: 
objectyype = xxx and key = ${customfield_12389}

The UI accepts that filter as valid, but in the create issue form it will show dialog with message:

We couldn't fetch any objects for this field

Remove attributes that no longer exist in the Assets Custom field configuration filter, and ensure the AQL query is valid.

I tried the following but none of them works. Either UI says invalid placeholder, or error message when using it. 
name = ${customfield_12389.name}
key = ${customfield_12389.key}
objectid = ${customfield_12389.id}

How do I reference another assets field using placeholder? 

KC Wong_akqwi1

It's a typo... objectType. And use label = ${customfield_xxxxx.label}