QB Issue Resolution:

After testing this area, there is a 300 character limit for the Customer Notes section of Point of Sale 2013.

Resolution for Issue 'Customer Account Notes in POS.' available: Yes (Solved).
Source: Intuit Community forum.

Customer Account Notes in POS.: 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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