How To Fix WTADDI210 - Purchase order for additional already created

SAP Error Message - Details

• Message type: E = Error

• Message class: WTADDI - Additionals: Messages

• Message number: 210

• Message text: Purchase order for additional already created

What causes this issue?

You wish to assign a vendor to <DS:GLOS.additional>additional</> &V2&
using workflow in additionals document &V1&. The purchase order has
already been generated, however.
If an additional can be ordered from a number of vendors, the system
can generate a workflow entry for selecting a vendor interactively (as
long as the relevant setting has been made in Customizing). This is
what has happened here.
When generating the additionals document, the system assigns the first
vendor in the list to the document. In the case of document &V1& this
is vendor &V3&, from whom additional &V2& has been ordered.

System Response

The system informs you that a purchase order has already been
generated.

How to fix this error?

Once a vendor has been selected, the selection cannot be changed. Flag
the workflow as "completed".

Error message extract from SAP system. Copyright SAP SE.