Confirmation control key missing for PO item & &

What causes this issue?

No confirmatiton key has been maintained in PO &V1&, item &V2&.
If you wish to process confirmations without a confirmation control key,
the supplier must either confirm individual PO items or the complete PO
with the quantities and delivery dates set out therein.
However, your supplier has confirmed different quantities or delivery
dates, or has sent an IDoc whose data cannot be processed.

How to fix this error?

You have the following options:
If you wish to allow confirmation of different quantities and delivery
dates, you must maintain a valid confirmation control key in the PO
item.
To do so, change the PO.
<DS:TRAN.ME22N>Perform function</>.

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

If your supplier is to confirm an individual PO item or the complete PO
with the quantities and delivery dates set out therein, contact your
system administrator or get your supplier to send you a new
confirmation.

Procedure for System Administrators

If you are working <ZH>without</> a confirmation control key, the IDoc
must have a processable action code at either header or item level:
At header level, the segment field ACTION of segment E1EDK01 must be
filled with the value '000' if the complete purchase order is to be
confirmed.
At item level, the segment field ACTION of segment E1EDP01 must be
filled with the value '000' or '004' if the PO item is to be confirmed.
Generate an IDoc with the relevant action code.
<ZH>Note:</>
If you are working <ZH>with</> a confirmation control key, the ACTION
field is not taken into account in IDoc processing.

Error message extract from SAP system. Copyright SAP SE.