Thank you Stu for your commens.
Yes silly from me, not to use #GE# ...
But as this criteria triggers OK for me, the main problem in fact is, that it does not trigger the conditions:
expression="($pier:width == '150')"
etc.
These are my OSM data:
I now tried 0150, but that did not help either:
together with
expression="($pier:width == '0150')"
The LOG looks OK so far, but finally, only the type
<[string8][geometry][..\objects\Piers\Pier_Wood_1_6\pier_wood_1_6]>
is exported.