I'm reading from a vendor-provided OPC-DA server, which is working fine, except for the tags that have CO₂, N₂, and O₂ in the item id. They contain the Unicode U-2082, "Subscript Two", character. When I create the tags in either PI Builder or PI SMT, PI seems to change the item ids to CO2, N2, and O2, i.e. replace the Unicode character with a normal ASCII "2".
Is there a workaround for this? This knowledgebase article suggests this is not supported, but the article talks about subscripts specifically, so I wasn't sure if it meant Unicode characters like this or something else (and would it happen with non-subscript Unicode characters like "°F" or an en dash like "–").
I'm querying a vendor-provided OPC server, so I'm not able to change the item id to just use ASCII characters.