POS show Bellow Error at starting new session on Odoo 11 Enterprise. What could be reason and how to fix it?
Error while validating constraint
Mixing apples and oranges: res.currency().union(False)
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Any customization you have added/installed ?
No customization, Just Added some fields using Studio in Invoice module but Not in POS module, . I didn't use the module before, i installed it and tried it for the first time.