How to use Invoke-VenafiRestMethod to update custom field

[tonyb2BB]

Looking to use VenafiPS to configure a custom field's list options. Basically want a custom field thats pulling a list from another source so will be somewhat dynamic as in adding a new option from time to time. For testing I have a new custom field named 'TestField' with 3 options. As I didn't see an Update Custom Field built-in functionality I'm trying to use the Invoke-VenafiRestAPI method to interact with the Metadata/UpdateItem endpoint as follows:
Invoke-VenafiRestMethod -Method Post -UriLeaf 'Metadata/UpdateItem' -Body @{'Update' = @{'DN' = '\VED\Metadata Root\TestField'; 'Data' = @{'Name' = 'ErrorMessage'; 'Value' = 'Test Help Message'}}}.

I've also tried taking it as pure JSON and then converting it to a PS Hash Table.
$json = '{

"Update":{
"DN":"\VED\Metadata Root\TestField",
"Data": [
{
"Name":"Help",
"Value":"Test Help Message"
}
]
}
}'
$hashtable = $json | ConvertFrom-Json | ConvertTo-HashTable
Invoke-VenafiRestMethod -Method Post -UriLeaf 'Metadata/UpdateItem' -Body $hashtable

Both methods I end up with the same error:
Error Locked Result

---

Metadata item has invalid values. The update Data is missing. False 15

If I look at my $hashtable, it appears to have the Data field added correctly.

$hashtable.Update.Data
Name Value

---

Value Test Help Message
Name Help

[gdbarron]

Hi @tonyb2BB, you were close, but I see 2 issues. The first code, Invoke-VenafiRestMethod -Method Post -UriLeaf 'Metadata/UpdateItem' -Body @{'Update' = @{'DN' = '\VED\Metadata Root\TestField'; 'Data' = @{'Name' = 'ErrorMessage'; 'Value' = 'Test Help Message'}}} has Data as a hashtable when it should be an array of hashtables (it looks like you fixed this in your second try). Also, a list type doesn't have an error message, only a string does when performing validation. When I try and update ErrorMessage for a list field I get a 400.

The following worked for me to update list options, Invoke-VenafiRestMethod -UriLeaf 'Metadata/UpdateItem' -Body @{'Update'=@{'DN'='\VED\Metadata Root\bb163985-c9a6-472c-ae2c-dc2f58e591f6';'Data'=@(@{'Name'='AllowedValues';'Value'=@('item1','item2')})}} -Method Post

[tonyb2BB]

Thanks! Got pretty close to this with further testing but still didn't have my hashtable array formatted correctly.