How To Fix UC135 - &1 already being processed by &2

SAP Error Message - Details

• Message type: E = Error

• Message class: UC - FI/CO Data transfer: errors during transfer

• Message number: 135

• Message text: &1 already being processed by &2

What causes this issue?

The object cannot be locked, because it is already being processed.

System Response

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

How to fix this error?

Try to process again later. It can happen that the lock entries still
exist, even though the object is no longer being processed. This
happens, for example, if the connection to the terminal is lost during
the transaction. In this case you can delete the lock entries manually:
<DS:TRAN.SM12>Delete lock entries</>.

Error message extract from SAP system. Copyright SAP SE.