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Once you have found a more suitable or more specific identifier for your substance, you can find the pre-SIEF of your substance (here bismuth tetroxide) in REACH-IT and use the functionality ‘Edit pre-registration’ to update your pre-registration (as advised in Q&A 377).
In the next step of the wizard, you should add the more suitable substance in the ‘Similar substances’ tab.
When this is done, you will be able to navigate from the pre-SIEF page of your substance to the pre-SIEF page of the similar substance using the ‘Read across to’ tab. You will not be listed as a member of this pre-SIEF, which means that you will be able to see the members of the pre-SIEF, but they will not be able to see you. For this reason, you will have to take the initiative and get in contact with them to explain that you wish to join the SIEF.
The ‘Similar substances’ functionality was designed for pre-registrants to list substances with similar chemistry, for which data may be used for grouping or read-across in the registration, in accordance with Annex XI of REACH. So not all substances listed in the ‘Similar substances’ tab concern registrants that want to refine their substance identity.
The ‘Similar substances’ functionality should not be used to fulfil the registration obligations for a substance other than the substance originally intended to be covered in the registration. The new identifier can therefore only refine the identity of the substance initially concerned; it cannot correspond to an entirely different substance.