QB SE is not convertible to qbo. You would have to transfer over beginning balances and start new.
Resolution for 'beginning balances issue: 'Need Help to move data from QB Self-Employed to Quickbooks Plus' available: Yes.
The beginning balances 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 beginning balances issue yourself by looking for a resolution described in the article. If it is a complex beginning balances issue or you are unable to solve the issue, you may contact us by clicking here or by using other beginning balances support options.
For more information about resolving issues related to beginning balances in Quickbooks/QBO or to get support for the issue 'Need Help to move data from QB Self-Employed to Quickbooks Plus', click the link below: