It's been almost two years since Angelina Jolie filed for divorcefrom Brad Pitt. However, the drama surrounding their custody agreement continues. 

A source tells E! News the celebrity parents are "at odds over custody" of their six children - Maddox, Pax, Zahara, Shiloh, Knoxand Vivienne. This dispute is reportedly "why the divorce is not final" and has "dragged on for months."

"The latest issue is that Angelina wants to film in Europe for months and take all six kids with her for the duration of the shoot," an insider told.

"Brad is opposed to that and is blocking it from happening. Brad will be filming in L.A. for the summer and wants to see the kids on his regular custody schedule."

The source tells Jolie is "furious" with the situation. However, it looks like Pitt isn't pleased with it, either.

"He's not OK with his kids being away for months," the insider continues. "He feels that Los Angeles is their home base and this is where it is best for them to be." 

However, this doesn't mean that Jolie can't travel with her kids at all. The actress already took Shiloh and Zahara to Jordan in January to visit a refugee camp. She also brought all of her children to Paristhat same month. The insider tells E! News Jolie recently travelled to England, as well.

"Angelina has been in London and is free to travel for shorter periods of time," the source says. "Brad isn't opposed to that. But she can't leave with the kids for several months."

When Jolie filed for divorce in September 2016, she asked for sole physical custody of the children. Pitt responded by filing for joint physical custody in November.

By December, the exes had reached a temporary agreement. The agreement determined that the children would stay in Jolie's careand that Pitt would have "therapeutic" visitation.

The temporary agreement came shortly after the Federal Bureau of Investigation closed its investigation into Pitt regarding an alleged incident with a child on a private plane.

No charges were filed. It also came after the Los Angeles County Department of Children and Family Services cleared Pitt of child abuse allegations.

Pitt opened up about the situation in an interview with GQ Stylepublished in May 2017.

"I was really on my back and chained to a system when Child Services was called," he told the magazine.

"And you know, after that, we've been able to work together to sort this out. We're both doing our best. I heard one lawyer say, ‘No one wins in court—it's just a matter of who gets hurt worse.' And it seems to be true, you spend a year just focused on building a case to prove your point and why you're right and why they're wrong, and it's just an investment in vitriolic hatred. I just refuse. And fortunately my partner in this agrees. It's just very, very jarring for the kids, to suddenly have their family ripped apart."