Tomas Palacios - Inter Milan: What is happening? Is the success of the deal at risk?

Tomas Palacios, for which Inter Milan will spend 6.5 million euros (£5.5 million) plus bonus, has already carried out medical tests.
"Last details. We’re there. Tomas Palacios is not yet Inter Milan's player, but the managements are still working to get to the white smoke. 

At the moment we are at the most classic of "just missing the signature". That black on white before the official". The article of La Gazzetta dello Sport opens on the deal between Inter Milan and Independiente Rivadavia for Tomas Palacios.

The 2003-class defender, for whom Inter Milan will spend €6.5 million  (£5.5 million)  plus bonus, has already had his medical tests yesterday but there are still some details to be solved. 

What is happening? And, most importantly, is the success of the deal at risk? 

According to Sky Sport, the reason is that Independiente Rivadavia and Talleres have not yet reached a final agreement for the player’s:
“The two Argentine clubs still have no agreement on the terms of the right to buy that Rivadavia had on the player. 

For the full definition, it is necessary that the two clubs agree on these terms of sale. Work is carried out with optimism for the final closure of the transfer” Sky Sport reports.