If after the sameness check or otherwise a company determines that the substance should have been pre-registered under a different EINECS number and that the company should be in a different SIEF, the company should contact the correct SIEF and proceed with data sharing andregistration for the correct substance.
ECHA has unofficially confirmed that it will not correct the pre-registrations in REACH-IT. Instead, the following steps are recommended to the companies which have made slight mistakes during their pre-registration:
Please note, that the above steps are appropriate only for the correction of an inaccurate pre-registration involving a related substance to the substance originally pre-registered (i.e. pre-registration based on a legitimate mistake). If the company pre-registered for an unrelated substance to the one that it manufactures or imports, ECHA advises that the company should suspend any activities involving the substance and proceed with the registration as required by the REACH Regulation before resuming its activities.
Information provided by McDermott Will & Emery
March 2009