How To Fix WD291 - Container element & is not multiline -> Appending not allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: WD - Workflow definition

• Message number: 291

• Message text: Container element & is not multiline -> Appending not allowed

What causes this issue?

You are trying to append values to container element &V1&. This is not
possible, because the container element is not defined as a multi-line
element.

System Response

Appending values is only possible for multi-line elements. For other
container elements, only the assignment operator can be used.

How to fix this error?

Enter a multi-line element as the result element for the assignment or
use the assignment operator "=".

Error message extract from SAP system. Copyright SAP SE.