The stars met in 2003, wed in 2014 and split in 2016

In a new court filing, Angelina Jolie is alleging that ex Brad Pitt has not paid enough child support and is asking that a court order make him comply.

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“[Pitt] has a duty to pay child support,” Jolie’s attorney, Samantha Bley DeJean, stated in a brief that was filed on Tuesday in Los Angeles Superior Court, according to NBC News. “As of present, [Pitt] has paid no meaningful child support since separation.”

A spokesperson for Jolie tells PEOPLE, “The aim of Angelina’s routine court filing is to provide closure to the marriage in a way that clears a path toward the next stage of their lives and allows her and Brad to recommit as devoted co-parents to their children.”

A source familiar with the situation, however, says of the court filing: “Brad fulfills his commitments.”

WATCH: What the New Ruling Means in the Brad Pitt and Angelina Jolie Custody Case

In the filing, Jolie’s lawyer added, “Given the informal arrangements around the payment of the children’s expenses have not been regularly sustained by [Pitt] for over a year and a half, [Jolie] intends to file an RFO [request for a court order] for the establishment of a retroactive child support order.”

Custody of their six children — Maddox, 16, Pax, 14, Zahara, 13, Shiloh, 12, and 10-year-old twins Vivienne and Knox — has been an ongoing issue.

Image zoom Brad Pitt and his children Gregg DeGuire/WireImage

In June, after the exes couldn’t reach a private agreement, a judge established a detailed schedule for Pitt to spend time with the children (except Maddox, who according to the court is old enough to decide for himself how much time he wants to spend with his father).

Jolie has “tried to bridge the gap between the kids and their dad,” the source tells PEOPLE. “She’s worked to achieve reinstatement for them. But it’s now between Brad, his kids, and the court. The court will determine things.”

The children are living in London with Jolie right now as she filming Maleficent 2, but normally reside in Los Angeles, where Pitt also lives.