The phrase "a precondition to a" is correct and usable in written English.
It can be used when discussing requirements or necessary conditions that must be met before something else can occur or be true.
Example: "Having a valid driver's license is a precondition to obtaining a car rental."
Alternatives: "a prerequisite for" or "a requirement for".
The US demanded that he went as a precondition to a settlement, but Russian credibility was at stake.
Russia is a member of the Middle East Quartet, which demands recognition of the state of Israel as a precondition to a seat at the negotiating table.
Rather, India's prime minister, Manmohan Singh, says a precondition to a settlement is that there should be no "redrawing of boundaries".
Imposing a tax on the poor as a precondition to a constitutional right widens the gulf between rich and poor and breaches the moral commitment in Gideon v. Wainwright to ensure equal access to justice for all.
Also, consultation with an outreach worker is not a precondition to a citation or arrest.
In an interview with Charlie Rose, Hamas leader Khaled Meshaal called on Israel to lift its 7-year-old blockade on Gaza, suggesting that was a precondition to a lasting cease-fire.
Nuclear disarmament would free up money better spent on conventional weapons and public services – but it isn't a precondition to an alternative to cuts.
Seoul has blamed a North Korean torpedo attack for the sinking of its corvette, the Cheonan, and the conservative Lee government has demanded an apology as a precondition to any substantive diplomatic talks or rapprochement.
Their demand that Assad step down as a precondition to peace or a political transition has become increasingly unrealistic.
Blair felt, perhaps rightly, that having a supportive media was a precondition to electoral success.
A top aide in the president's office also privately confirmed the policy change, saying an apology was "not a precondition to resuming the talks".
