So, I just ran getMBRecordInfo (https://github.com/schymane/ReSOLUTION/) on the directory, extracting precursor and exact mass automatically from CASMI2016 from the OpenData SVN; checking the difference flags exactly and only these 4 records as having a mass difference above/below ~1.007
SM858801, SM858902, SM858951, SM859002

Thanks to diagnosis from Herbert Oberacher the case is now clear (see issue online for case history):

SM858801 is diphenhydramine
SM858902 and SM858951 are Acetyl-sulfamethoxazole
SM859002 is citalopram

So, how to update? If I update the compound information to match the spectra then we will have a mismatch between the internal IDs, UFZ IDs and the MassBank accession numbers. However if I change to the correct internal IDs we'll be changing accession numbers and I think this is worse. If I hear nothing back I will correct the compound information in these four records and send along updates when I get a chance.

@meier-rene @tsufz @meowcat

Is deleting the incorrect records and adding new and correct records an option?

Well, the records need to be fixed, this is for sure. However, if I correct the processing error, we will end up with new accession numbers. I am not sure this is the right way to fix it in this case though. This is the compound list ... it is still inexplicable how this happened as it's kind of impossible the way that RMassBank works, but something certainly went wrong! According to the compound list, 8588 is certainly meant to be Finasteride but ended up as the compound info of finasteride with the spectral data of diphenhydramine ... do you see the problem? If I now reprocess then the SM858801 record will turn into SM858901 and SM858902 will become SM859002 ...
I think best would be to update the compound info with the current accession numbers otherwise we are going to run into awful versioning problems?

I understand the problem - is it a reasonable option to upload the records under a tag that is not SM? In that way the new, say SZ records will have the correct internal ID, and the old ones should be marked obsolete... Just an idea. Not yet thought through.

OK here goes with a complicated update to address issues in the CASMI spectra, I suggest @meier-rene implement this at the MassBank-data side, and I'll double check to confirm once done, and comment the commit where necessary (@meier-rene other ideas welcome if you see an alternative). This has been double checked with the data source (Martin Krauss).
Note for the record: NONE of these issues actually affected the CASMI contest. It was an inadvertent upload of files that were extracted but eliminated during quality control for the contest. But we need to fix the database now ;-)

https://massbank.eu/MassBank/RecordDisplay.jsp?id=SM872102
This is a spectrum of Exemestane (identical SPLASH), please update the compound information in SM872102 to match the compound information of Exemestane in this record:
https://massbank.eu/MassBank/RecordDisplay.jsp?id=SM873802&dsn=CASMI_2016

https://massbank.eu/MassBank/RecordDisplay.jsp?id=SM871901
This is a spectrum of Trenbolone (identical SPLASH), please update the compound information in SM871901 to match the compound information of Trenbolone in this record:
https://massbank.eu/MassBank/RecordDisplay.jsp?id=SM874601&dsn=CASMI_2016

https://massbank.eu/MassBank/RecordDisplay.jsp?id=SM840901
This should be simazine, please take the compound information from SM841901
The analytical information is correct.

https://massbank.eu/MassBank/RecordDisplay.jsp?id=SM841901
This should be Desethylterbutylazine, please take the compound information from SM840901.
The analytical information is correct.

The other ones we need to correct are indicated above, i.e.
SM858801 is diphenhydramine => please take compound information from the current
https://massbank.eu/MassBank/RecordDisplay.jsp?id=SM858902&dsn=CASMI_2016
The analytical information is correct.

SM858902 and SM858951 are Acetyl-sulfamethoxazole => please take compound information from the current https://massbank.eu/MassBank/RecordDisplay.jsp?id=SM859002&dsn=CASMI_2016
The analytical information is correct.

SM859002 is citalopram => please take compound information from an existing record, for instance:
https://massbank.eu/MassBank/RecordDisplay.jsp?id=EA290112&dsn=Eawag
The analytical information is correct.

With compound information I'm referring to the CH$ entries, ie
CH$NAME: Diphenhydramine
CH$NAME: 2-benzhydryloxy-N,N-dimethylethanamine
CH$COMPOUND_CLASS: N/A; Environmental Standard
CH$FORMULA: C17H21NO
CH$EXACT_MASS: 255.16231
CH$SMILES: CN(C)CCOC(c1ccccc1)c1ccccc1
CH$IUPAC: InChI=1S/C17H21NO/c1-18(2)13-14-19-17(15-9-5-3-6-10-15)16-11-7-4-8-12-16/h3-12,17H,13-14H2,1-2H3
CH$LINK: CAS 58-73-1
CH$LINK: CHEBI 4636
CH$LINK: KEGG D00300
CH$LINK: PUBCHEM CID:3100
CH$LINK: INCHIKEY ZZVUWRFHKOJYTH-UHFFFAOYSA-N
CH$LINK: CHEMSPIDER 2989
CH$LINK: COMPTOX DTXSID4022949