QB Issue Resolution:

the item you use from products an services on sales receipts or invoices determine the account that is posted to for the sale

you can enter back dated transaction when you wish, but realize that they will affect current balances

Resolution for Issue 'How do I categorise a sales receipt by account and class?' available: Yes (Solved).
Source: Intuit Community forum.

How do I categorise a sales receipt by account and class?: 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.

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