How To Fix VSB304 - Transfer &1: Transfer must have status "D" for this function

SAP Error Message - Details

• Message type: E = Error

• Message class: VSB - Self-Billing Procedure Messages

• Message number: 304

• Message text: Transfer &1: Transfer must have status "D" for this function

What causes this issue?

The processing indicator cannot be set for transfer &V1& as this does
not have status "D" (processing completed without errors).)

System Response

The function cannot be executed.

How to fix this error?

The processing indicator for transfers can only be set if these have
been completely and correctly processed.
The processing indicator can however also be set if the transfer is not
active. At present, a deactivation can only take place by the system
itself, for example, if the "Duplicate check" (check for duplicate
external transfer numbers) has recognized a duplicate.
You can set the processing indicator for deactivated transfers
regardless of the transfer status.

Error message extract from SAP system. Copyright SAP SE.