QB Issue Resolution:
in company settings, customize form delivery, you can check mark to include an account summary, try that and use print preview to see if it works for you
Resolution for Issue 'I am invoicing a client who still has not paid their last invoice. How can I make their old balance due added to my new invoice?' available: Yes (Solved).
Source: Intuit Community forum.
I am invoicing a client who still has not paid their last invoice. How can I make their old balance due added to my new invoice?: 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 Invoice
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Error Recovery for Invoice [Canada]
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