QB Issue Resolution:

Try this:

I know it sounds crazy but — Go into the sales order and select a different sales tax item and save. Then select the correct sale tax item and save.

Apparently quickbooks is having a problem with sales orders and invoices when the sales tax item has been edited on one and not the other (although why that should affect whether or not the sales order show up on the open SO report I don’t understand). It worked for me.

Resolution for Issue 'Open sales order report' available: Yes (Solved).
Source: Intuit Community forum.

Open sales order report: 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 sales order
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Error Recovery for sales order [Canada]
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