Returns true if the passed in Invoice number is valid
o.isvalidinvoice( tcInvoice)
Return Value
True or False
Parameters
tcInvoice
The invoice to validate
Remarks
This function is handy for determiniing if an invoice number is valid (in use).
Example
o.IsValidInvoice("13455523")
The above would return true if the invoice number "13455523" existed in the invoice table
See also:
Class rp_invoices