On 16 April, ECMWF reported that SYNOP BUFR reported by Hungary contained operator 2-08-035 before the standard sequence 3-07-080. The operator affects the length of the first string element in the sequence, namely the name of station.
Everybody in the expert team IPET-DRMM shared the view that it is not plausible style of work, but this is not explicitly prohibited by the B/C1 regulation. I've made a question to ECMWF about what is acceptable for them, since it is also not nice to BUFR implementors worldwide to comment after their work. I hope it will serve as good rule of thumb:- a B/C template without extension, i.e. the section 2 consists of single sequence only.
- a B/C template followed by other descriptors
- if the extension contains local number, that must come with local table version number more than zero
Entire story can be traced at the thread:
https://groups.google.com/a/wmo.int/d/msg/cbs-ipet-drmm/o7ITsHaER24/QQzIh0MwM9sJ
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