QB Issue Resolution:

I don’t know what an “RO” is; sorry.

A Purchase Order is meant to be used for you to submit to vendors for quotes, and/or for tracking fulfillment of orders you placed with others.

An Assembly Item is something you “build” internally.

Edit that assembly item that you are listing on the PO and there is box to checkmark, that allows you Buy it OR Build it. That is the message you are getting. Edit that specific Assembly Item that you are Buying, because you are not intending to build it using that bill of materials as an internal production process.

Perhaps you set up Assembly Items, not really knowing what they are or how they work? Perhaps what you want to order is done using Group Item. You can read about the differences between Assembly and Group, in the Help system.

Resolution for Issue 'Why does this message “I purchase this assembly item from a vendor” come up when I am trying to save a purchase order and how do I get rid of it so I can save the PO?' available: Yes (Solved).
Source: Intuit Community forum.

Why does this message “I purchase this assembly item from a vendor” come up when I am trying to save a purchase order and how do I get rid of it so I can save the PO?: 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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