HU & is already assigned to object & &. Differences are not allowed

What causes this issue?

You can only execute the inventory in the warehouse for handling unit
&V1&, which is assigned to object &V2& &V3&, without differences.

System Response

You therefore cannot enter a count which differs from the inventory
balance.

How to fix this error?

Delete the document assignment for handling unit &V1&.
Execute the inventory for handling unit &V1&.
Post the differences in Warehouse Management for the inventory.

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.