Why can't I update these custom fields in Salesforce?

Question

Greetings, Well I am bewildered. I have been tasked with updating a PHP script that uses the BulkAPI to upsert some data into the Opportunity entity.

This is all going well except that the Bulk API is returning this error for some clearly defined custom fields:

InvalidBatch : Field name not found : cv__Acknowledged__c

And similar.

I thought I finally found the problem when I discovered the WSDL version I was using was quite old (Partner WSDL). So I promptly regenerated the WSDL. Only problem? Enterprise, Partner, etc....all of them...do not include these fields. They're all coming from the Common Ground package and start with cv_

I even tried to find them in the object explorer in Workbench as well as the schema explorer in Force.com IDE.

So, please...lend me your experience. How can I update these values?

Thanks in advance!

Clif

Screenshots to prove I have the correct access:  

Answer 1

So the custom fields I believe you're trying to update live in the Convio Common Ground package. Presently, there are only 2 installed licenses for this particular package. The licenses must have not been defined to any of your user accounts.

If you try to run into this, you should be able to view the licenses on the manage packages page under setup. Try drilling through the package in the question given and it should list the users who are licensed to see it.