Identified May 11th 2016
An update was introduced to accommodate the use of symbols in Product Item Codes and Descriptions, to allow pass through to Xero. If you use a symbol (such as an &) in the Product Item Code or Description, the number of characters may increase by 4, as special characters are required to be escaped, as such an & will be become #amp; which is the code for the same. It is recommended that special characters are excluded from item codes to prevent symbols affecting data transfer.
If you are receiving the error Xero Validation Error: Price List Item Code must not be more than 30 characters long, but haven’t created or made any changes to your Products, this may be the reason. If your Product Item Code was close to 30 characters, it may now be over the 30 character limit.
Configure Extended Product ID Length Handling