Enum describing possible invoice errors.
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                Enum unspecified. | 
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                The received error code is not known in this version. | 
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                Cannot request invoices issued before 2019-01-01. | 
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                Cannot request invoices for customer who doesn't receive invoices. | 
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                Cannot request invoices for a non approved billing setup. | 
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                Cannot request invoices for a billing setup that is not on monthly invoicing. | 
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                Cannot request invoices for a non serving customer. |