No goods receipt can be posted for scheduling agreement item &1 &2

What causes this issue?

You have tried to post a goods receipt for JIT calls. However, at least
one of the calls is linked with scheduling agreement &v1&, item &v2&.
The production supply indicator of this scheduling agreement item does
not have the value 'Z'. This means that this scheduling agreement is
not intended for JIT outbound calls.

System Response

The goods receipt posting is terminated.

How to fix this error?

Change the value for the production supply indicator of the scheduling
agreement to 'Z'. In the <DS:TRAN.ME32L>Change Scheduling Agreement</>
function, you can find the production supply indicator under <LS>Item
-> Additional Functions -> Additional Data.</>

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.