The old delivery schedule &1 is not identical with delivery schedule &2.

What causes this issue?

The old delivery schedule &V1& in the purchase scheduling agreement is
not identical with the
<DS:DE.LABNK>delivery schedule</> &V2& in the sales scheduling
agreement.
In the electronic data interchange (EDI) message, the customer sends the
new and the old (previous) delivery schedule keys. The system compares
the old one with the current delivery schedule in the sales scheduling
agreement. If they are identical, the system updates the current
delivery schedule according to the new one.

System Response

The system stops processing the EDI message.

How to fix this error?

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

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.