The phrase "a discussion over a" is correct and usable in written English.
It can be used when referring to a conversation or debate about a specific topic or issue.
Example: "We had a discussion over a potential partnership with the new company."
Alternatives: "a conversation about a" or "a debate regarding a".
I found myself butting heads again during a discussion over a proposal to grant ecosystems a legal status with their own government.
The questions over fiscal policy were captured in a discussion over a paper presented by Alan J. Auerbach of the University of California at Berkeley.
Awareness of what work has been done, what task has been misunderstood, what problems have been raised, what issues have been clarified, and understanding of why a team or a software engineer does not follow the project plan, and how to carry out a discussion over a multi-site distributed environment and to make a just-in-time decision are the challenge.
Implicitly, Mr. Bush has agreed to engage the country in a discussion over a fundamental change in America's national security strategy: his doctrine that perilous times have forced the United States to assert a right to launch pre-emptive strikes against any state that could put weapons of mass destruction into the hands of terrorists.
In Uruguay, you are more likely to engage a winery owner in a discussion over a silky tannat than endure a 30-person tasting overseen by a seasonal amateur with a microphone.
Later, though, Mr. Obama credited Mr. McCain with making a valid argument in a discussion over federal payments to private Medicare Advantage plans.
It is unclear how much assistance Iran will provide, but even a decision to enter into a discussion over the allegations would be a major departure from Iran's frequent simple refusal to talk.
The F.T.C. and the Justice Department have begun a discussion over who will lead an inquiry into Apple's restrictions on the terms of service for developers of the iPhone.
When travelling around the world, Catalans will often find themselves in a bar or at a discussion over dinner, and they will be asked if it's really worth saving the Catalan language.
They said that Ms. Blanco had been caught by her boss as she secretly taped a discussion over the sale of fuel to a Miami-based anti-Castro group, the government statement said.
