GR quantity is greater than GI quantity (in order unit) for item &1

What causes this issue?

This message only applies to CW materials. You can customize this
message with view /CWM/V_T160M. If you select the <ZK>Error Message</>
setting, the system acts as it does for the standard material settings.
A check is then performed for stock transport orders for the goods
receipt and goods issue quantity in the order unit. The goods receipt
quantity may not exceed the goods issue quantity.
If you do not customize this message as an <ZK>Error Message</>, you can
set the delivery completed indicator if the goods receipt quantity is
not the same as the goods issue quantity.

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?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.