This error message is received when an invalid invoice number the technician is trying to use is not valid.  An invoice number can only contain a letter if that letter is at the beginning of the invoice number.  Examples of valid invoice numbers: A305100, x305100, E9960

Instruct the technician to go back to the Invoice screen, click in the text box in the upper left-hand corner (Invoice # box) and take the invalid character(s) out of the invoice number.

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