Delivery note/service entry sheet & & does not exist

What causes this issue?

You have entered a delivery note number which does not exist in the
system.
<ZH>Note:</>
IF &[SWITCH]S4H_DOCU_CLOUD& = 'X'.
For Invoice Processing you can change the category of this message in
the implementation tool <ZK>Manage Your Solution</> under <ZK>Configure
Your Solution</>
ELSE.
For Logistics Invoice Verification you can change the category of this
message in Customizing for Invoice Verification.
ENDIF.
This would make sense when in the case of invoices arriving before the
goods receipts you park the invoice and process the document once the
delivery note has been entered. The following describes the procedure if
the message is configured as an error message.

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 the number you have entered and make any necessary corrections. If
your entry is correct, you cannot enter the invoice using the delivery
note number. Proceed as follows:
If the invoice contains a PO number, use this as a selection criterion.
If the invoice does not contain a PO number, position the cursor on the
field <LS>Purchase order</> and press F4. This allows you to list all
the purchase orders for the supplier or for the material listed in the
invoice. Additional information contained in the invoice you are
processing (such as quantity or price) will allow you to find the
correct purchase order in the list and select it.

Error message extract from SAP system. Copyright SAP SE.