Shipment or delivery qty. must be fully assigned to exchange call-offs.

What causes this issue?

The total quantity of the delivery item or of the shipment per
material/plant must be assigned to one or more exchange-related
purchase call- offs, because the fulfillment indicator is set to 'E'.

System Response

Information.

How to fix this error?

<ZH>Continue.</>
A confirmation window appears, in which you can decide if you want to
save the incomplete assignment or if you want to return to the
assignment screen and enter the missing assignment.
Before you post the delivery or shipment <ZH>you</> <ZH>must</>
<ZH>ensure</> that every item whose fulfillment indicator is set to 'E'
is completely assigned to exchange-related purchase order call-offs.
Otherwise, you will get an <ZH>error</> <ZH>message</> during posting.

Error message extract from SAP system. Copyright SAP SE.