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Hi @Calumc12 ,
It may be an issue with the type conversion of Column, please refer the following posts, hope them will be helpful.
https://community.powerbi.com/t5/Desktop/OLE-DB-or-ODBC-error-Expression-error/m-p/441189
Best regards,
Community Support Team _ zhenbw
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
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