How can i get a subsystem to be researched?

[LeviathansWrath]

Okay im having trouble trying to get the siege cannon to first be researched before you can build it but the game desks when i tried this, if anyone knows how plz explain.

[Dim@]

You would make the research like a "tech", i.e. with no target. Or rather, it has a target, but no UpgradeName, the target is simply so the UI knows what icon to show it under.
Example (Based on the hiigs' destroyer tech):

{
           Name =                    "SiegeTech",
           RequiredResearch =        "",
           RequiredSubSystems =    "Research | AdvancedResearch & CapShipProduction",
           Cost =                     1500,
           Time =                     90,
           DisplayedName =            "Siege Cannon Technology",
           DisplayPriority =        3,
           Description =            "Enables construction of siege cannons",
           TargetName =         "Hgn_SiegeCannon",
           Icon = Icon_Tech,
           ShortDisplayedName = "Siege Cannons",
    },

Then, in the research prerequisites of the siege cannon subsystem, you add that research.
Example (Based on the Vaygr Hyperspace module):

    { 
        Type =                     SubSystem, 
        ThingToBuild =             "Hgn_SiegeCannon",
        RequiredResearch =        "SiegeTech",
        RequiredShipSubSystems =    "",
        DisplayPriority =        20,
        DisplayedName =            "Siege Cannon",
        Description =            "Insert description here" 
    },