QB Issue Resolution:

if you have multiple unit of measure turned on, you set the base unit to each, then create a related unit patch=1000 eaches (multiple u/m is not implemented well, so I do not recommend it)

you can create a group item, patch, then list the inventory item and the qty of 1000, and use that on the invoice or sales receipt

Resolution for Issue 'How can I set unit of measure in a patch like 1000 a time?' available: Yes (Solved).
Source: Intuit Community forum.

How can I set unit of measure in a patch like 1000 a time?: 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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