Question juridique clé
Whether A.________ AG's bid was invalid for lacking the required submission note on the envelope
Solution extraite
The bid was not shown to be formally defective; the exclusion was arbitrary.
Motifs extraits
The post submission receipt and the administration's own note showed that the tender had been mailed in time and with the required label. The cantonal court's contrary conclusion lacked support in the file and was therefore untenable.