© Reuters. FILE PHOTO: A logo of defence group Leonardo is pictured on their booth during the European Business Aviation Convention & Exhibition (EBACE) in Geneva, Switzerland, May 22, 2017. REUTERS/Denis Balibouse

MILAN (Reuters) – A former sub-contractor of Leonardo did not sell components to Airbus, the Italian defence group said on Friday.

Shares of the Italian state-controlled conglomerate fell more than 7% on Thursday after Boeing (NYSE:BA) said parts supplied by Leonardo sourced from the sub-contractor had been improperly manufactured.

Leonardo said Manufacturing Processes Specification (MPS) had not supplied titanium components for Airbus programs.

MPS is listed as an Airbus approved supplier in a document available on the planemaker’s website.

Leonardo shares were volatile on Friday on the Milan stock exchange. They were rising 0.33% at 1245 GMT, underperforming Italy’s blue-chip index FTSE MIB, up 0.5%.