How To Fix UCS0030 - Task &1 that precedes task &2 in period &3/&4 is not blocked

SAP Error Message - Details

• Message type: E = Error

• Message class: UCS0 - Messages for Status Management

• Message number: 030

• Message text: Task &1 that precedes task &2 in period &3/&4 is not blocked

What causes this issue?

Task &V1&, which precedes task &V2&, has not been blocked yet.
Therefore, task &V2& cannot be blocked.

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?

If you want to block task &V2&, you first need to block all of the tasks
that precede &V2&.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.