QB Issue Resolution:

No it is not

You will have to make your own bar code for one of the two items

or if you are stocking a roll of hose and cutting to order, stock the hose as each = 1 foot, and one the order enter the qty as how many feet to cut

Resolution for Issue 'How should inventory be entered when it has the same barcode as another inventory item?' available: Yes (Solved).
Source: Intuit Community forum.

How should inventory be entered when it has the same barcode as another inventory item?: 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 barcode
Quickbooks Repair Pro will resolve it efficiently and affordably. Guaranteed resolution of your issue, or you pay nothing!

Error Recovery for barcode [Canada]
E-Tech is the #1 Quickbooks data migration and Conversion service provider.

Get 50% off Quickbooks Online

Click Here for 50% off!

Additional Support Options: