MM agreement & is still connected to exchange &

You can delete the exchange header only when there are no connection to
the SD- or MM-Agreements.

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?

Please delete at first the displayed agreement from the Exchange. This
is only possible if there are no release order to this MM-agreement.

Error message extract from SAP system. Copyright SAP SE.