Yes, you can have a client using pro and they send you the file and you make the changes and send them back to him.  The most common reason I have had (which is why I rarely use this feature anymore) is that the client removed the accountant’s copy restrictions.

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Resolution for 'client using issue: 'We use QuickBooks Accountant Premier and client uses QuickBooks Pro and he is unable to incorporate the changes from the Premier version into his Pro version.' available: Yes.

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

For more information about resolving issues related to client using in Quickbooks/QBO or to get support for the issue 'We use QuickBooks Accountant Premier and client uses QuickBooks Pro and he is unable to incorporate the changes from the Premier version into his Pro version.', click the link below: