It depends on the version your client is using. The 2017 accountants version can open a file from 2016 & 2017 but can’t open a file from 2015 & prior.  So it can open current version & 1 year back.

Resolution for '2017 accountants issue: 'Accountants copy transfer file' available: Yes.

The 2017 accountants 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 2017 accountants issue yourself by looking for a resolution described in the article. If it is a complex 2017 accountants issue or you are unable to solve the issue, you may contact us by clicking here or by using other 2017 accountants support options.

For more information about resolving issues related to 2017 accountants in Quickbooks/QBO or to get support for the issue 'Accountants copy transfer file', click the link below: