LONDON—A London court ruled Friday that Citigroup Inc. isn't entitled to payment in a $270 million dispute with commodities trader Mercuria Energy Group.

The case has been closely watched by banks and traders involved in so-called sale-and-repurchase, or repo, agreements of the kind between Citi and Mercuria. It could change the way banks view risk when entering into these kind of financing arrangements.

The dispute revolves around a series of transactions since 2013 in which Mercuria sold metal to Citi with an agreement to buy it back later at a higher price. The sale was essentially a way for Citi to make a loan to Mercuria, with the metal as collateral.

Problems arose last year, when a fraud scandal emerged at the two Chinese ports where the copper and aluminum stocks underpinning the deals were stored. The two ports were closed as Chinese authorities investigated whether local traders had used stockpiles of metals to secure multiple loans from Chinese and foreign banks.

It isn't clear what has happened to the metal Mercuria sold Citi.

Citi and Mercuria aren't accused of wrongdoing.

As news of the issues at the ports began to trickle out, the banks and traders with metal stored there scrambled to assess the damage.

In June Citi demanded early repayment for its deals with Mercuria. The trading house responded with a legal challenge.

Almost a year later on Friday, a London judge upheld Citi's right to terminate the transactions early, but found that Mercuria shouldn't have to pay back the $270 million in dispute because the bank had been unable to deliver back the metal.

"The judgment is a very positive one for Mercuria and clearly vindicates the position they have taken since the start of the case," Peter Bennett, a partner at Mercuria's law firm Stephenson Harwood LLP, said in a news release.

The case is far from closed though and Citi has vowed to continue to pursue its claim.

"Citi will vigorously pursue compensation from Mercuria for failure to deliver or safeguard the metal once further facts are established," the bank said.

"This judgment will shape the future of the inventory finance activity for commodities," one seasoned commodity banker said.

Write to Sarah Kent at sarah.kent@wsj.com

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