The decisive leg was scheduled to be played on Saturday but was suspended until Sunday after Boca players were injured when their bus was attacked by River fans outside their Monumental stadium in Buenos Aires.
There's no date yet for when it will be played.
Boca's request for the latest postponement centred on a desire for the showpiece continental decider to be played "under equal conditions" following the "acts of violence" that were witnessed on Sunday.
After an initial delay on Sunday, with gates due to open at 1 p.m. local time, fans were allowed to enter the stadium ahead of the eagerly anticipated second leg before the decision to postpone it came.
CONMEBOL has also confirmed a new date for the game will be decided at a meeting between the Boca and River presidents on Tuesday.
"I met the manager and players last night and then asked our lawyers to prepare a document and presented it via e-mail and in person to CONMEBOL authorities in their hotel".
Boca president Daniel Angelici said it was a "sad day for Argentinian soccer", while head coach Guillermo Barros Schelotto said the final could not go ahead because the attack had left his team at a "sporting disadvantage".
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After running to relative safety a few hundred feet away, hundreds of the caravan members held a sit-in. She said she never would have gotten that close with her daughter if she thought there would be gas.
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Police security for the game was supposed to be tight, yet as Boca's team bus approached the stadium, fans within a crowd of River supporters pelted it with rocks and beer cans, smashing most of its windows along one side.
"We can not play. They are forcing us to play the match". Lamardo had trouble breathing because of the gas.
"We call for a peaceful final with respect between rivals to show the best face of South America to the world", he said.
The "superclasico" final between Argentina's two most popular teams, already known worldwide for their fierce rivalry, was dubbed the most important club match in the country's history.
Tato Aguilera of TyC Sports reported that at least three Boca players were hurt, one being starting midfielder Pablo Perez who returned to the stadium with an eye patch.
Boca were kicked out of the competition, while River were given a bye into the quarter-finals.
This year's Copa Libertadores final is finely poised at 2-2 after the first leg in Boca two weeks ago. The decision has been taken.