Russ,
thanks for your feedback.
You are absolutely right. It was I mistake and I corrected this just now.
Kind regards
Paul

https://en.wikipedia.org/wiki/Wikipedia:WikiProject_Thailand

I saw this in the WikiProject Thailand

Rural roads should be tagged with ref=pf.nnnn where pf is the provincial prefix in Thai characters, followed by a dot, followed by the
numerical portion of the reference number. There should be no spaces in the ref tag value.

Russ
Thanks for the remark. I fixed it.
Kind regards
Paul