Calculation to check attachment data

I am in the need for a Condition that will check to see if a collection has an attachment added or not.

Here is my calculation:

import System

static def GetAttributeValue(Change):

    Documented = "False"

    Value = Change._FTSDocumentationCol.Latest()

    if Value != null:

        if Value._AttachmentDocument != null: Documented = "True"

    return Documented

This is the rest: Condition Equals Specific Value True

I add this as a precondition before an action can run and I don't see the action even though the Attachment Document is not NULL in the database.

Any thoughts?

I need to get run working because I have to do another and somehow merge them into one condition because the requirement is that 2 documents must be there from different collections before an action can be selected.

Thanks!