Bin &1 also used for PSA &2

What causes this issue?

The storage bin &v1& that you have entered for your production supply
area (PSA) is used in PSA &v2&.

System Response

The system cannot determine the quantity proposal for staging correctly.
The quantity for staging or for clearing the PSA might not be correct,
especially if you are using crate parts or cross-order staging.

How to fix this error?

Use different storage bins for each production supply area.
When the system issues the message as a warning, it is possible that the
staging may work as required. Check your product and its product group
manually to ensure that you do not have an overlap.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.