[BUG]: Protect against mixed units during partner placing request

[awwaiid]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

In the Units-Beta, if I log in as partner and place a request with the same item but differing units, the qty is merged and only one of the units is kept.

Expected Behavior

It should error when there are mixed units trying to be merged.

Steps To Reproduce

No response

Environment

- OS:
- Node:
- npm:

Criteria for Completion

No response

Anything else?

No response

Code of Conduct

• I've read the Code of Conduct and understand my responsibilities as a member of the Ruby for Good community

[github-actions]

This issue is marked as stale due to no activity within 30 days. If no further activity is detected within 7 days, it will be unassigned.

[github-actions]

Automatically unassigned after 7 days of inactivity.