To reproduce:
open /gretl/POE4data/nls_panel.gdt
start (interactive) R session
in R:
> head(gretldata)
hours, age, exper are lost
renamed variables
schmours=hours
schmage=age
schmexper=exper
are read ok.
Seems, there must be variables' counter and a warning message for such situations.
The predetermined names sets are different in different packages. So, one
doesn't know beforehand. Should be a warning.