Good to hear from you, I hope you are doing well!
The reason that is empty is that it is ALMOST obsolete and can be removed from the meta-model. I actually dealt with this recently in the specialized package removal work that is in progress (https://support.onefact.net/redmine/issues/7769). With the introduction of generic packages this shortcut is replaced by R640. That relationship is only used by verifier and only for a single command (sender) (see Functions::OAL Validation Utility Functions::sender_validate). I believe it could actually be removed even for that case, and thus completely remove R694 from the meta-model, but I choose to leave it for now simply because keeping it for this single case is a bit safer then removing it at this time. I would prefer the task to remove it be done as a stand-alone project where the testing can be properly focused to assure it is done right and removal has not unexpected side effects.
The removal work for 7769 is done, but testing is not. The fork/branch is https://github.com/rmulvey/bridgepoint/tree/7769_remove_sp
If you are able and interested in helping push this forward by helping with testing, let me know and I will get you started.