Having two templates doesn’t create what you are describing for your accounting.

Having multiple templates is like having different colored Paper.

You are describing that your older transactions did not reveal Due date to you, so it was never under your control. You still would control it by using Terms, either defaults […]

Resolution for 'colored Paper issue: 'Can you advise how to merge intuit invoices with customized invoices into accounts receivables?' available: Yes.

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

For more information about resolving issues related to colored Paper in Quickbooks/QBO or to get support for the issue 'Can you advise how to merge intuit invoices with customized invoices into accounts receivables?', click the link below: