Difference indicator not allowed for putaway of HU

What causes this issue?

The difference indicator entered is not allowed during putaway of a
handling unit. The message is output in the two following situations:
The goods receipt posting has already occured for the handling units to
be put away, and the difference should be posted to the source storage
bin, or
the handling unit to be put away is not yet posted for goods receipt,
and the difference should not be posted to the source storage bin.

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

System Response

The difference indicator entered is rejected by the system.

How to fix this error?

If the goods receipt has already been posted for the handling unit to
be put away, the difference must not be posted to the source storage
bin. If the goods receipt has not yet been posted for the handling
unit, the difference quantity can only be posted from the source
storage bin.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.