Xero Export failed: Tax rate must be Active
In markets outside of the US, UK, Australia and New Zealand, Xero has a series of default tax rates that are supplied "out of the box". One of these is "Tax on Purchases" which has a invisible label behind it (something you and I don't see) called "INPUT".
You, as a user, can set that tax rate from the default 0% to the tax rate of your jurisdiction. Lets for the sake of argument say you are a South African company, therefore you should set it to 14%.
When invitbox sends data to Xero, the way we tell Xero that an that an expense carries tax is by telling Xero that the value needs to have "INPUT" applied to it. Xero then knows that "INPUT" relates to Tax on Purchases, and that Tax on Purchases has been set by you to be 14%.
But, Xero allows you to add or delete tax rates.
If you delete a tax rates such as "Tax on Purchases", you cannot reinstate it. From a Xero perspective it is now permanently inactive. If you delete it, you also delete 'INPUT" from Xero's records.
If invitbox sends to Xero that an expense needs to have INPUT applied to it, but you have deleted INPUT from Xero's memory, the import will fail. In effect Xero says "I have no idea what INPUT means".
So in short, DO NOT DELETE THE DEFAULT TAX RATES THAT XERO PROVIDES FOR YOU
Xero Export failed: Account Code 'xxx' is not a valid code for this document
The Account Code/GL Code you have chosen for the bill cannot be used with purchases. When invitbox sends bills through to Xero, Xero expects you to assign an Account Code that relates to purchases.
From the Signed Off tab, click MORE > Return to Approved to send the bill back to the previous tab where you can assign a different Account Code to it. Then sign it off again, then try to export again.
Xero Export failed: The document date cannot be before the period lock date, currently set at xx-xx-2013
You are trying to export bills with a date that is in a date range of a locked out period within Xero.
In Xero - unlock the date period and the export from invitbox will now work.
If reporting is already done for this period, some customers will choose to change the invoice's date instead, but this is a personal choice and both may have negative consequences.