How To Fix AD_SUBCON257 - Specify a valid purchase order.

SAP Error Message - Details

• Message type: E = Error

• Message class: AD_SUBCON - Messages for Subcontracting

• Message number: 257

• Message text: Specify a valid purchase order.

What causes this issue?

You have specified a scheduling agreement in the <ZK>Purchase Order</>
field.

System Response

The system does not allow further processing if you specify a scheduling
agreement in the <ZK>Purchase Order</> field.

How to fix this error?

Specify a valid purchase order.

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.