Unable to execute service, but can trace successfully - ACL Problem?


I’ve having the following problem when executing a service in webMethods 6.1

com.wm.net.NetException: [ISC.0064.9314] Authorization Required: [ISS.0084.9004] Access Denied
    at com.wm.net.NetURLConnection.getInputStream(NetURLConnection.java:267)
    at com.wm.driver.comm.b2b.http.SessionHTTPLink.transportMsg(SessionHTTPLink.java:95)
    at com.wm.driver.comm.b2b.http.HTTPLink$HTTPSendReceive.run(HTTPLink.java:453)
    at java.lang.Thread.run(Thread.java:534)

However, it allows me to trace through the code.

I don’t have Admin access, but the ACL for the package isn’t default.
The service ACL has:

Enforce Execute ACL: “When top-level service only”

Can a package ACL allow for only tracing but no execution?