BOC chief executive Tony Issacs said scheduling and invoicing had been affected by the problems, but insisted the firm had not lost customers.
"We are standardising on SAP globally and we have learnt lessons from this implementation," a BOC spokesman said. "We could have spent more time preparing our staff and we could have ensured the data going into the system was better. We see this as our responsibility." He added that two subsequent SAP implementations had gone to plan.
In April, ICI chief executive Brendan O'Neill lost his job after problems with a SAP implementation led to a profits warning and a 40% share price slump.