OpTeX trick 0092 does not work for bibstyle iso690

[M0M097]

OpTeX trick 0092 does not work if iso690 is choosen as the bib-style.

test.log

test.bib.txt
test.tex.txt

[olsak]

The OpTeX trick 0092 says: "Note: style iso690 doesn't work with \fcread now". It means that if I knew a simple solution, I would use it.

[M0M097]

Thanks, I somehow missed this.
I tried to create my own workaround by calling

\nonumcitations
\nocite[key] 
\let\oldpar\_par
\let\_par\relax
\usebib/c (iso690) test 
\let\_par\oldpar

but now I still have a large horizontal space before the entry is printed. I tried to understand usebib.opm and to figure out how this can be suppressed, but failed so far. Could you give me a hint on how to suppress this? If this would possible one could probably use \bibpart to create an independent bibliography with only one entry and print this one with \usebib

[olsak]

I don't understand how to use the presented workaround. The \fcread (iso690) test still doesn't work.

[M0M097]

Sorry, I should have been more clear. This is not hack to make \fcread work. The idea was to have a dedicated bibliography with only one entry (which can be done with \bibpart) and to then print only this one entry with \usebib.

The arising issue is then, that \usebib applies some formatting which I find hard to turn off. Even if the citation numbers are turned off and _par is set to do nothing (which avoids a line break if \usebib is called), there is still a large horizontal space added whenever \usebib is called (and _par is set to \relax).