New Delhi, April 4 -- A tanker carrying Iranian crude oil, which was headed to India's west-coast terminal of Vadinar, has changed course to China, possibly due to documentation issues, two officials aware of the matter said. The vessel, Ping Shun, a large crude carrier, is now headed to Dongying in China, according to the Kpler-owned MarineTraffic, which tracks ships based on transponder signalling. "None of the agents at the terminal received any documentation related to the Ping Shun, which is required. Ports offer services based on booking and necessary clearances," a port official said. The Eswatini-flagged Ping Shun's transponders and AIS (automatic identity system) had earlier signalled it was headed for the Vadinar offshore terminal and expected to reach by April 4. The ship, operated by a Chinese firm, was headed to India subject to its fulfilling of all "legal documentation mandated by international maritime protocols", an official aware of the matter had said on Wednesday. Several reasons may be behind the apparent change in course, including issues related to price, insurance, operating crew or documentation, a second official said, requesting anonymity. To be sure, he said he had no knowledge of why the ship opted out....