In most children’s games, there are no takesies-backsies. A similar principle seems to apply when a company signs a pretty ironclad contract to buy another.

Late on Tuesday, Dallas-based freight forwarder Omni Logistics said that it had filed a lawsuit against trucking company Forward Air asking for the Delaware Court of Chancery to enforce the merger agreement that both companies signed back in August. This follows a statement last week in which Forward said it might terminate the controversial acquisition, arguing that Omni—which happens to be one of its trusted suppliers—had failed to comply with merger obligations.