Source handling unit of &1 WTs not found

What causes this issue?

The source handling unit (HU) is not found for the warehouse task (WT)
while checking reserved quantities.
This can happen due to following reasons:
Inconsistency between the /SCWM/LAGP and /LIME/NTREE tables
Missing entry from the /SCWM/HUHDR table

System Response

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

How to fix this error?

Check inconsistency between the /SCWM/LAGP and /LIME/NTREE tables.
Select the warehouse task (TANUM field) from the /SCWM/ORDIM_O table.
Copy the SGUID_HU field of the entry to the GUID field in the
/LIME/NTREE table.
Display the entry and copy the GUID_PARENT field of the entry to the
GUID_LOC field in the /SCWM/LAGP table.
If the entry cannot be displayed in the /SCWM/LAGP table, it means that
there is an inconsistency between the /SCWM/LAGP and /LIME/NTREE tables.
Check if there are any missing entries from the /SCWM/HUHDR table:
Open the /SCWM/ORDIM_O table.
Set the warehous task number.
Copy the SGUID_HU field to the GUID_HU field in the /SCWM/HUHDR table.
Display the entry.
If the entry cannot be displayed, it means that it is missing from the
table.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.