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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.

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Issue Solved, Payment method was not set. 

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