Upgrade without obsolescence?

[CivilizationAce]

As far as I can tell once a unit can be upgraded then it can't be built.

Anyone know a way around this please?

 

[Gleb Bazov]

I have not tested this, but, as far as I can tell,

-- unit obsolescence is handled by MandatoryObsoleteTech or MandatoryObsoleteCivic in the Units table, and not by:
-- anything in the UnitUpgrades table (comprised of Unit and UpgradeUnit columns).

Have you tried removing MandatoryObsoleteTech or MandatoryObsoleteCivic (whichever is active) for an upgradeable unit and testing whether both units remain available?

 

[NameArleadyUsed]

Have you tried removing MandatoryObsoleteTech or MandatoryObsoleteCivic (whichever is active) for an upgradeable unit and testing whether both units remain available?

Not supposed to work.
Warriors have Rifling as MandatoryObsoleteTech and still they cannot be build after swordsmen became avaliable.

Workaround idea: delete units (is this even possible?) from production menu and create projects that grant these units after completion.