A clothing distributor on four wheels has hit a roadblock in the Hub and risks being stopped dead in its tracks.

Since March 1, the city has told Derrick Cheung, co-founder of Green Street Vault, that he’s no longer allowed to sell urban apparel from his specialized truck while parked in the Back Bay or Downtown.

“We are the first truck in Boston to do this,” said Cheung, noting the “grey area” for operations.

Cheung’s shop has held a “hawkers and peddlers” license for the last eight months without issue, he said.

But after recently being “harassed” by workers from the city’s Inspectional Services division and racking up citations, Cheung has had to scale back sales.

“[They are] stalking us and making sure we aren’t in the [Back Bay] area,” he said.

Cheung said he and partner Howard Travis want to obtain a special license, but that they aren’t able.

“The only permit that exists in Boston is for vendors selling roasted nuts or sunglasses,” said Cheung.

City officials said they are merely following protocol, not singling out Green Street Vault.

“Boston Proper has regulations … taking up the parking meters, selling out of the truck is restricted,” said Michael Mackan, chief of Boston’s Code Enforcement Police.

“There are rules and regulations and we enforce them,” he said.

A spokesperson from the mayor’s office said there are currently no permits for retail trucks like Green Street Vault in Boston.

Cheung said he hopes to work “collaboratively with the city” to reach a compromise on the issue and possibly create a new type of license catering to shops like his.

“We chose to start Green Street in Boston for a reason: because we love this city. We in no way view City Hall as the bad guy,” he wrote in a blog post on the company’s website.