QB Issue Resolution:

Unfortunately, there’s a limit on the account numbers that can added in QuickBooks. With QuickBooks 2014, account numbers are limited to 7 digits. QuickBooks 2012 can only be allowed up to 12 digits, with that being said, we couldn’t add more from it.

This article provides information on the maximum number of list entries (list limits and custom fields). You can refer to this article for clarification – http://support.quickbooks.intuit.com/support/articles/INF12412

Resolution for Issue 'Can Quickbooks Enterprise Solution 12.0 handle more than the current amount of digits for G/L Account numbers? How do I set up the availability for the additonal digits?' available: Yes (Solved).
Source: Intuit Community forum.

Can Quickbooks Enterprise Solution 12.0 handle more than the current amount of digits for G/L Account numbers? How do I set up the availability for the additonal digits?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for Chart of Accounts
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