For Gen 8.5 or 8.6, trying to consume a web services in a Gen Action Diagram via the Call External statement. However, that command statement seems to be grayed out (disabled) in the Toolset.
One additional note...The 'Call External...' statement will also show as disabled if you are NOT on the first line of the Action Diagram. For example if you create a new AB and add a blank line, and then attempt to add the 'Call External...' statement after the blank line, the statement will show as disabled in the Toolset. The statement must be added from the first line within the AB. This is the same for both Gen r8.5 and r8.6 releases.