Transfer requirement & & is currently blocked

What causes this issue?

While processing a communication record received in the decentral WM
system, the system attempted to change an existing transfer requirement
(such as a goods receipt or goods issue cancellation posting). The
posting was initiated in the Inventory Management system and, when
processed, would normally change a transfer requirement that was created
earlier in the decentral WM system. This transfer requirement is
currently being processed by another user.

System Response

The system did not process the communication document and marked it "in
error".

How to fix this error?

Attempt to repost the communication record manually. If the same error
occurs again, find the reason why the transfer requirement is blocked
and repost the communication record a second time.

Error message extract from SAP system. Copyright SAP SE.